[I wonder if that's why I haven't received any response to my inquiries.
Louis is a member here. See
https://www.eevblog.com/forum/chat/apple-turning-the-thumbscrews-on-louis-rossman/msg975054/#msg975054Having watched some of this videos, in a number of them, he says he gets over 800 emails a day (even before this event). Your email is probably in his inbox with thousands, maybe tens of thousdans of others, not to mention all the youtube comments.
I also seem to recall that he usually only specialises in Apple repair and usually doesn't fix other things. From his FAQ
https://www.rossmanngroup.com/faq/Are you only Mac?
Yes and no. For network and server issues we can help with any platform.
While we can work on PC laptops, we are limited in the services we offer. It’s nothing elitist; I wrote this entire site on my Thinkpad T520! The issue is most of the PC laptops we see cost almost as much to fix as the machine is worth and we find that people’s time constraints do not often allow for a proper estimate. It is feasible to stock most Apple laptop parts that we need, but not feasible to stock every single PC part there is, there are too many models. Considering the time constraints of our customers and the lack of ability to stock every PC laptop part there is, we’re just not best suited to servicing most PC laptops. If we feel we’re not the best fit for your issue, we will refer you to someone who is.