the airline will indeed always say yes. It's a strange misconception by the senior members in this group who keep advising to ask an airline about their enforcement policy.
The reason they'll always say yes is slightly different though: they are supposed to check this and a check is always possible if the check-in crew has time/feels like doing it. On the phone they cannot promise that you can get away with breaking the rule, they'll always tell you what's officially required.
even if they don't enforce strictly, they'll always say that you need it on the phone. Things like enforcement strictness are much better asked in groups where people can share experiences.
the unfortunitely here is that the Thai law doesn't specify exactly how this works, so it leaves room for interpretation. So indeed airlines could give it their own 'flavor'. But in principle this shouldn't be different by airline of course, these aren't their rules.
Happy to read that some accept within 90 days. Stupid requirement, that no country should have. The less strict it's interpreted by anyone, the better.