I think you are right but it still implies that LTT has a valid unbiased opinion on the product now.
If the opinion presented in that video was shared before any business relationship was concieved, I'd hardly consider the opinion invalid.
That and the Dave2D endorsements have been there since the first laptop.
It might be before we knew about the investment...
There are detailed videos from Linus on this topic. No conversation took place about investment until after he did his review video. When we first saw the video (at the same time as everyone else did), we assumed he was joking about wanting to invest.