You are quite right and I said from the outset that the STS on the Max is different to the NG but the basic premise is similar. The aircraft will attempt to trim itself during manual flight to correct a speed variation or stall. I’ve not flown the max and I don’t profess to know the intricacies of its system.
However, I believe on both types, you can still use main electric trim to reverse and correct an undesired STS input. (It will wait 5 or 10 seconds and then have another crack at it). And the Runaway Stabilizer checklist will rectify the fault (even if you are left holding the trim wheel).