It's clear that Will has rubbed you the wrong way by his responses in this thread, but when you call out someone's professional conduct linked to their business in public forum words matter.

Lead generation into Amazon affiliate links are not a sponsorships.

His business makes money off of affiliate links, not sponsorships. There is a difference. Both could carry a bias, but a sponsorship is significantly more suspect than an Amazon affiliate program. For another example, see Wirecutter, also funded by affiliate links, but (until recently post NYT buy out issues) a pretty respected review site. Personally, I generally wouldn't buy anything off the recommendation of a YouTube sponsorship. I would consider buying something that had an affiliate link.

Feel free to let me know if I missed a sponsorship disclaimer.

Here is the disclaimer his website.

Prowse Publications LLC (www.mobile-solarpower.com) is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com I make a commission for sales made through affiliate links posted on this website