What you are missing here is:
Existential risk apart from AI
People are dying / suffering as we hesitate
Yes, there is a good argument that we need to solve alignment first to get ANY good outcome, but once an acceptable outcome is reasonably likely, hesitation is probably bad. Especially if you consider the likelihood that mere humans can accurately predict, let alone precisely steer a transhuman future.
It is also very easy to just do. Buy fries, extract fat in hexane, evaporate hexane and submit the fat you obtained for analysis.
Edit: It might even be possible to DIY the analysis if it is not commercially available: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4609978/. (IR spectroscopy and AgNO3-DLC look somewhat accessible though I would have to look deeper into the topic to be sure.)