You can throw that premise out the window with Craig Wright Jr.'s bath water given that if I've done the math correctly, currently, bitcoins can be subdivided to eight decimal places, viz. 0.00000001, but in the future could be coded to nine decimal places - 0.000000001 - thus ten times more units negating "a stable supply". Similarly, ten decimal places, eleven, twelve, etc., depending on worldwide demand.
That said, this latest revelation is fucking with me and Vlad. Somebody get me an apple.
Sorry, Gleb. The supply is only increased when a block subsidy is generated in a coinbase transaction, currently 12.5 BTC every 10 minutes (on average). Whether that 12.5 BTC comes in the form of 1.25 billion sats or in the form of 12.5 billion Gleb-sats (tenths of a sat) is irrelevant to the amount of supply increase. Both represent 12.5 BTC.
After the year 2120 or so (when the last BTC has been generated), the supply will never increase. Cutting a sat into ten little pieces (which is equivalent to selling something like "ten Gleb autographs for 1 sat") is not an increase in supply.