Fat is not the problem.
The biggest problem with Thai food is all the seed oils and refined sugar added.
Look at some fish sauce labels for example. You wouldn't think of fish sauce as having sugar but it does. I have seen different brands from 1% to 6% added sugar.
There are now some keto fish sauces available. I have seen Dek Somboon and Squid brand.
I like Sriracha sauce but it is 17% sugar so I don't use it anymore. I did find Dek Somboon makes a keto version of it too.
Silly thing is they charge you more for not adding sugar to it. Some of it uses stevia instead. That's probably more expensive than sugar.