See this is exactly the sort of thing this part of the the thread is interested in. What data backs up this opinion and where did you hear it? Genuine question, because I have not yet followed up a criticism that ended up being that strong. I only have so far seen 'this looks too much like they were just begging the question' type critiques, that hold water.
I doubt you will get a response from the person you are addressing. However, I know that this misinformation comes mainly from Alejandro Caraballo and Erin Reed, along with other activists.
The idea that only two studies were accepted comes from the fact that only two studies were rated high quality (out of 103 studies). Misinformation was spread shortly after the final report was published, stating that over 100 studies were rejected, 98% were rejected, or only two were used (along with the misinformation that the reason for rejection was based on studies not being blinded RCTs), and this all went viral. The activists mentioned above were two of the major sources of misinformation. Of course none of this misinformation about methodology would have been circulated if activists liked the report's recommendations. As I said before, the recent NZ review downgraded almost all studies as low quality, as did reviews in other countries such as Sweden, but there is hardly a word about that because it hasn't yet been linked to major policy changes or cited in US litigation.
The strange claim about Cass backtracking on the report is harder to fathom, but I believe it originates from a
blog post by Erin Reed concerning an
interview Cass gave with the Kite Trust. The Kite Trust published an interview where they referred to Cass' answers in third person, showing they were not directly quoting Cass, and put some creative spin on the responses (basically telling people what they wanted to hear). This obviously conflicted with the original misinformation circulated about the review and both can't be true. Obviously Reed cannot admit that misinformation about the report was circulated, and can't say that the Kite Trust is fibbing, so the only way to resolve this was to pretend Cass had now backtracked on what was said in the report. This issue is addressed somewhat indirectly in the last point of the Cass
final report FAQ.
The idea that the 'only two studies included' had worse methodology that the ones rejected follows logically from the accusation that Cass cherry-picked studies showing what she wanted. It is assumed therefore, that the two accepted must have conclusions that are negative towards GAC, and therefore they must have 'Wakefield bad methodology' because everybody knows science is on the side of GAC. In fact, the only study of puberty blockers that got a high quality rating was positive towards blockers. This was one of the Dutch studies that did have flaws but just scraped a high rating because the scale used to rate study quality was so lenient. Activists are actually saying that a key study on which the affirmative approach is based is 'Wakefield bad' because they need to believe that this study must not actually support the affirmative approach, otherwise the claim that studies were cherry-picked to suit the agenda of evil transphobes collapses. Of course they don't realise that the study they are dismissing is one that supports the affirmative approach, because they have not actually looked at any studies.