Nah. Knowing that someone has fucked 100 people, what this 4chan user is talking about, just tells you that that person does not view sex and relationships as a single thing.

You only get a body count that high by doing one-offs, where you are just looking for sex and aren't trying to turn it into a relationship. That tells you nothing about how good a partner they will be once they actually enter one.

This assumption that sex should only happen between partners in a relationship is exactly why people jump into self-destructing relationships instead of waiting for a person they actually vibe with.