Hard to say. Linus has always made it sound like his investment in Framework is a personal one, not one made by LMG. If that's the case, then I think any potential issues could be largely sidestepped by just having someone else do all the laptop reviews.

If that's not the case and LMG is directly involved with Framework, then it gets a bit tricky. To their credit, they've done a good job of disclosing the Framework investment whenever the company is brought up, but I don't watch most of LTT's review content, so I'm not sure if it's being mentioned in the context of other laptop reviews. If not, it needs to be.
The whole point of having that kind of disclosure though is so people know that the information being presented is potentially biased. At a certain point, it's on the audience to take that bias into account and cross reference other sources before making any purchasing decisions. I'm not sure there's anything LMG can really do to alleviate the perceived conflict of interest, unless they just stop reviewing laptops altogether. Whether or not it's ethical to continue reviewing laptops in that context, even with a full disclosure, is a question I don't have a good answer to.