Interesting video, but as the person notes, he and his Thai legal staff have seen nothing officially of a change in financial requirements for retirement. But he does note that it may be a an indication of changes that will come about in the (near?) future.
Will such change come about -- IMO it is possible. The current requirement for 800,000 baht has been in place for more than 20 years. Needless to say, costs in Thailand have increased over those years. But, if it does come about, it most likely will only impact those obtaining visas or doing first extensions after rules are officially changed (which, as yet have not happened).
In the past, when changes were made, those already on extensions of stay were "grand fathered" in and so long as they keep their extensions continuous, the old amount (800k for most of us. Section 2.22 of the current Immigration Police order governing extensions has the following re those that were on extensions of stay prior to October 21, 1998:
(6) An alien who entered the Kingdom before October 21, 1998 and has been
consecutively permitted to stay in the Kingdom for retirement shall be subject to the following
criteria:
(a) Must be 60 years of age or over and have an annual fixed income with fluids
maintained in a bank account for the past three months of no less than Baht 200,000 or have
a monthly income of no less than Baht 20,000
(b) If less than 60 years of age but not less than 55 years of age, must have an annual
fixed income with funds maintained in a bank account for the past three months of no less
than Baht 500,000 or have a monthly income of no less than Baht 50,000