AFAIC we know one thing: it will start on January 1, 2024. So until then money earned before December 2022 and transferred in 2023 isn't taxable. So plan ahead.
Also BOI interpretation is now that income earned abroad by LTR visa holders is not taxable for the duration of the visa. i.e money earned before and after is.
We should read carefully the Thailand Revenue Code, and maybe discuss it with a tax agent, to assess the risks of doing or not doing certain things. (cash transfers, splitting income with your wife, etc..).