I noticed your changes on the Piano page had already been rolled back by someone citing "promotional editing"... I saw your small edit in the history, and I wouldn't agree as you were merely mentioning PTQ as an example of modern modeling technology. I would suggest you take that up in the Discussion for the Piano page.
As for the Pianoteq page - good start! I made a small edit, correcting a couple typos and adding a link to the Youtube interview of Philippe, since that not only talks about PTQ but also acoustic pianos and the generations in between.
I would suggest putting a few headings in the page to give it some structure - I had thoughts on heading titles earlier but can't remember them now
In any case, I would focus on the stuff explaining what modelling is and how it differs from previous technologies, perhaps illustrating that with how Pianoteq implements things. This is because if the PTQ article doesn't survive due to it being deemed "too commercial" – at least the stuff on technology can be moved to a page on Modelling, where Pianoteq could still be mentioned as being a pioneering product.
My 2 euro-cents