Are my passwords really secure in Edge or Chrome?

BruceRoberts 

When someone is able to hack into his computer then he/she is pretty much able to crack that login file too, since they both use the same password. that could even be the only reason his computer would be hacked.

This one is better, taken from the same topic you linked to:

Windows user's password. This means that every other program running under your Windows user is able to decrypt the login data. In fact, that's how tools like ChromePass and ChromePasswordDecryptor work. They only decrypt the file and reveal the passwords only if you run them on the same system that encrypted the file (or, perhaps, provide the victim's Windows password).

so once a hacker has gained access to that system, they can remotely run those programs or even create one of their own (which is super easy) and gain access to the user's password.

Anyway, the OP explicitly said "someone to hack into my computer" , once that is done, everything else is like drinking water 🙂

Bottom line, don't let your computer be hacked in the first place because that opens the door to everything else.