Because they're getting paid to recommend it, which is inherently dishonest. That should be obvious.
And why link to Amazon at all? Link to the manufacturer instead:
https://www.lenovo.com/us/en/laptops/thinkpad/thinkpad-x1/X1...
It's his recommendation, it doesn't say he is working for Lenovo, or Amazon. If he can be paid to generate money for Amazon and Lenovo, because he recommended someone to a product on a specific platform, why shouldn't he collect it?
If it was a Lenovo shill that linked to Lenovo shop then that would be fine, because it didn't have a referral link?
https://m.do.co/c/79e624bd349b
Of all the providers I've tried, Digital Ocean™ is definitely the okayest.
Also I didn't ask for any recommendation, so what you did there is pretty much spam.