It's ridiculous to say the least.
Also summed up in the Bangkok post article, socialism... paying Thai's 10k THB each... its to pay for that.
Put into perspective, i'd hazard a guess this policy will rip the bottom out of the property market, consumer stables market, and so on, literally leading to Thailand going through financial chaos.
I know people living in Thailand spending 1-2m$ a year (Europeans, Old money) they will exit, theres hundreds spending 500k-2m THB a month - they will exit... then there's the average income and pension aged that will feel the squeeze.
Also consider if you will, the sheer amount of wealth transfer from Russia, China, and Ukraine to Thailand over the past two years, and how that will stop due to this taxation, Russian's literally buying property they can truly never own, setting up businesses paying fair wages to Thai's, that will all end.
UK, EU, US funds are obsolete compared to that wealth influx... in-fact arguably from experience of observation, most Europeans/US are broke a*s beer bellied sex-pats.