This is the statement, a lot of people here disagree with it for a number of reasons (and it's pretty understandable)
But it's not necessarily wrong, Jiraiya had "Demonic Illusion: Toad Confrontation Chant", which is how he defeated those 3 paths, Pain is very clearly far superior to Jiraiya in stats, but that doesn't mean he would've lost.
Also, shortly after the genjutsu was used, Pain tells Jiraiya to not underestimate his enemies, if anything, this leads me to believe that if he had used it while the 6 paths were together (he could have probably baited Nagato into activating all of them) he could've put all of them into the genjutsu (I'm assuming this because the genjutsu was successful)