Actually, he disses Czerny, too.
Bernhard believes you should only play Czerny if you are inspired by the music.
He advocates developing your technique through repertoire. If you love a piece, play it. If you have difficulty with a certain part of the piece, don't turn to Hanon or Czerny or Dohnanyi finger exercises, or anything like that - just practise that part.
Bernhard has plenty of posts about how to effectively overcome difficult sections, if I remember correctly.
Galonia summarized it brilliantly.

And you may be very surprised to learn that I actually enjoy many of Czerny´s exercises as
music.
I do however abhor Czerny as a
method for acquiring technique, that is, either you must do the whole book (he has several thousand books, by the way), one piece after the next (have you noticed I am calling them “pieces”, rather than “exercises”? Starting doing the same and your whole consciousness will expand!), or you select the ones who will address the problem(s) you are convinced you have. To that end, Czerny gives – in his op. 740 – little helpful subtitles. And here is when the whole thing falls apart.
Consider this little gem of a subtitle, if ever there was one: op. 740 no. 2: “Passing under of the thumb”. The piece itself is basically built on arpeggio figurations over two octaves, first on the right hand, then on the left, and then on both hands together.
Had he put in his subtitle: “Dealing with arpeggio figurations”, all my criticism would be void. But by describing the aim of the piece as facilitating passing under of the thumb, he immediately showed me:
i. His ignorance of anatomy and ergometrics: passing under of the thumb is
not the motion with which to acquire facility in playing arpeggios.
ii. His lack of observation towards his and his student´s actual technique, since I am assuming that both he and at least some of his students would have been able to play this piece. If so, then they would have of necessity used thumb over – since
it is the only way to play this piece at the suggested MM = 60 (for a dotted minim).
iii. His lack of pedagogical flexibility, since he must have been faced with many (perhaps the majority) eager and adoring students who – by trying hard to comply with his misguided directions – were totally unable to play the piece, or at least to play the piece at anything approaching the real tempo. Did it ever cross his mind that perhaps “thumb under” was a wrong direction? What did he tell these students? “You have no talent for the piano. Go and be a truck driver.”
So anyone (yes, that includes Liszt as well) who proposes “thumb under” as the desirable technique to acquire in order to play fast scales and arpeggios has immediately lost all credibility as a piano pedagogue. (I am not suggesting that Liszt ever did that though).
Then when Galonia (very correctly) says:
He advocates developing your technique through repertoire. If you love a piece, play it. If you have difficulty with a certain part of the piece, don't turn to Hanon or Czerny or Dohnanyi finger exercises, or anything like that - just practise that part.
A lot of people read that and take it to mean that all you have to do is to repeat the challenging passage over and over again.
This is not practice. Somehow they miss what she says next:
Bernhard has plenty of posts about how to effectively overcome difficult sections, if I remember correctly.
Yes, you do remember correctly. True practice is far more complex, intellectually and physically demanding than lazily doing some technical exercise or repeating over and over some small section in the hope that somehow it will turn up all right.
I plead not guilty.

Best wishes,
Bernhard.