I don’t believe that’s how it works. The opposite would have to be true too. You go from 20p upto £200 and all of a sudden the RTP has completely changed on the amount it is allowed to pay. A machine cannot all of a sudden go from being willing (allowed) to pay £100 to paying £1,000,000.
We’ve seen in the past what happens when RTP is held back. BAR X gives 3 nudges to an inexperienced player who nudges wrongly and gets no feature. Next spin, it comes again. Keep doing it, it will have no choice but to directly roll it in. RTP has leeway but is not allowed to break rules.
Slot bosses would be like “oh damn, joe just upped his stake 10,000 fold and slot gave him a million, this slot aint gonna pay anything for 14 years now.