Why do you need 20k baht? If you mean the "20k baht proof of fund requirement to get back into Thailand", it's fake news. I've border bounce that border around 20 times in the last 10 years and I've never once being asked nor known anyone who have been asked. They do not ask any question at that border, nor care about your passport history of shady visas or what's not. Nong Khai and Mukdahan are the same in that regard, hassle free border to border bounce from.
You said "woman foreigner they never ask for financial but I also got a single entry non-o", this can imply that if you had ask for a multi entry they may have asked. Your wording was a bit confusing because its as if the single entry was important which it wasnt. There is no proof of funds for you regardless single vs multi entry.
Again, not what I'm asking. Most people here are from countries that will be on such list. No disrespect intended to India, Pakistan, most African countries, etc, it's always harder for them. Any proof or link of such 90 days new visa exempt?