Wrong!
The reason you get low amplitude is, you set lift angle at 52 degrees. Rolex 3235 lift angle should be 55 degree.
If you see amplitude around 300 with 52 degree lift angle setting, that's fake VS3235. VS3235 is a true clone and you should observe around 270 degrees.
The thin barrel wall does not mean low torque. If you place a genuine Rolex barrel to a VS3235, the minute wheel could be damaged in the first day because of higher torque.
You are correct about the 3235 having a lift angle of 55°. The lift angle used in that timegrapher reading isn't shown though and if 52° was used, it would result in an amplitude reading 10-15° too low. I also agree that a 3235 reading 300 amp at 52° would indicate a problem, since it's true reading at the correct 55° lift angle would be 10-15° higher and 315° is too high. But I don't agree that it immediately implies a fake VS3235, it could just be one with an undesirably high amplitude.
Regarding the mainspring torque, the 3235 mainspring barrel has the same outer diameter as the 3135 but a narrower outer wall (half thickness). This in addition to a thinner, longer spring contributes to the extended power reserve. Then the more efficient escapement (longer, thinner pallets and skeletonized escape wheel) adds additional PR because it needs
less torque from the mainspring per tick. The thinner mainspring is by design weaker and delivers the lower torque required.
This is a really good though fairly technical article analyzing the 3235 elements from which the quote is taken.
https://watchesbysjx.com/2021/05/rolex-chronergy-analysis.html
"Chronergy’s improvements claim an improvement in escapement efficiency of 15%. This has two benefits, one being the torque needed to drive the escape wheel can be reduced, which means a less powerful mainspring made up of thinner metal ribbon. That leads to the second benefit, which is a longer power reserve contained the same barrel, since a longer and thinner spring can be accommodated in a given volume."
So I contend that putting a gen 3235 mainspring into a VS3235 should not have any ill effect since both mainsprings already provide approximately the same PR and therefore must have roughly equivalent weaker torque than their 3135 predecessors. A gen mainspring might be inherently stronger than a cheap rep one, but the rep doesn't have the more efficient escapement so it shouldn't be affected by a slightly stronger mainspring if that scenario was presented.
Also the VS3235 could theoretically have its PR increased another 15 percent by fitting it with a gen pallet fork and escape wheel, which I have done on one.