yes, income remited to Thailand, for what I read, is taxed, But when you already have saving (for many years), you can say you remit to thailand your saving, and not your income, and so pay no tax ? General the tax system of most of the country don't care if you remit the income or not, they tax it ( and it is logic ... )
to be exact new income from after 1 January 2024 that you remitted to thailand ( I guess soon the remitted part will be cancel, logic to be tax worldwide ..), I can live on saving, that mean I don't have to pay tax on my income ( who stay out of thailand ) ? Not logic ..
some rumor come that for the soft thai power, you may need to provide appointment or lesson booking. ( they will probably do later some more checking, probably more for the soft thai power dtv .. ), for now they will probably ask you nothing ( as the dtv was delivered for something already checked recently .. ).
Globaly i think you always ( for the 5 years ) be able to prove that the dtv is still used in the purpose of the delivered dtv ....
I guess at minimum watchout the date, multiple account may be from transfer from bank to bank .... I see sometimes people say need to be in same bank account .. but depend of people and situation I guess