Many of his video titles are just clickbait, but he has a good point. You should always repair safety related faults, but ultimately spending hundreds (more like thousands if you don't DIY everything) more till you put it in a junkyard is a waste of money.
Granted if you hope to resell the vehicle for much more than $1K, you have to remember that every fault yours has, makes it less desirable than other vehicles on the market. Unless the vehicle is rare, few people who are in the $1K car market, want to spend that much again to fix it up, unless they are a mechanic themselves and have more resources to fix the vehicle up in their spare time, not needing it for a daily driver at the time.
No matter how nice you keep your ride, once it gets below about $5K, odds are that an accident will total it. Buy it back if you can fix it, we're all generalizing here while individual owners and vehicles can deviate from what makes the most financial sense to the average person with the average vehicle.