Since these folks are still apparently doing quite a bit of business and nobody seems to have answered the specific question:
Long and short of it, it's true that your money is safe with eBay's guarantees, but I would worry with this seller that you could be wasting your time.
In my anecdotal experience with them, they were legit in that they sent a product with the specs they said (a 2019 MBP with particular specs, the amount of battery cycles stated, etc.). However, they wildly overstated its condition: the "like new" product had a dent to the corner that slightly damaged the backlighting, and obvious liquid damage to the keyboard. They said it passed their evaluation and they never would have mailed out a computer with even the dent, but ¯\_(ツ)_/¯ They even scrimped on the power supply, sending an 87W rather than this model's 96W. For that, they offered a partial refund of $20.
Luckily, they apparently also missed that it was still covered under AppleCare+, so an incident fee covered everything. I opted to keep it rather than going for a refund, since I'd be getting really like new components, and didn't want to hunt for the exact configuration in that condition again. Left negative feedback since they didn't give me the item in anything like the stated condition, which they got removed, keeping their 100% rating.