From what I have been reading for the past few days are not on AMD but on the criticism on the report, its timing, the 24 hour window and credibility of CTS-Labs. Others call for details/explanation of the exploit.
From one of the forums I frequent, a user has posted link to https://www.youtube.com/watch?v=ZZ7H1WTqaeo&feature=youtu.be. The video has explained the released report might be on the biased side of things with questionable motives.
Also, check out fudzilla’s article: https://www.fudzilla.com/news/45819-torvalds-wades-into-cts-labs-amd-chip-security-report. Note that others also accord fudzilla.com articles with a grain of salt.