Is this a good deal? Used car advice

Hey guys, hope everybody is having a great day.
While dealing with my Highlander's situation I have been in search of another daily driver to get me around.

Long story short: I uploaded a few dozen pictures, including 2 videos of engine noise on the vehicle listed above. I am verbally committed to purchasing it for $4,300 next week. It's considerably lower in price than the rest of the market. Private seller, family owned, maintained with receipts vehicle, genuine nice guy selling it.
What do you think? My biggest concern is the sound the engine is making, I posted two videos on this link. They are also posted here; I added more photos in case it was too much for the post. I included the vehicle information on the ad as well.

I'm located on the East Coast and the market is wild, even rust buckets are expensive. I have narrowed my search to primarily Toyotas under 150k miles for under $8,000 (but the less I spend the better). Countless hours of scrolling, searching, messaging with no responses, sketchy responses, and months of stress - I finally found something I am willing to pull the trigger on.

We shook hands and agreed on $4300.

This guy was an honest and knowledgeable guy, he had receipts from all the maintenance he's done and told me a lot about the repairs he's done on this vehicle. We talked about this engine noise, and he says he doesn't know exactly what it is.