According to the blog, BitTorrent v2 now tightens the possible block size to power of 2. But does that still allow for the blocks to be variably sized and creat

According to the blog, BitTorrent v2 now tightens the possible block size to power of 2. But does that still allow for the blocks to be variably sized and created by, for example, a rolling hash-based chunker, like Buzzhash or Rabin? I'm asking, because this would allow for sharing of big files across swarms, even though the files might be slightly different.