I mean, that's a pretty significant sample size so I'd lean towards them knowing something.
You can always do the math to be sure though. You can look at how large the population is and figure out how many people in a population that large over a sample size that big would hit those rates naturally if picking blind. If there are far more than to be expected then I'm sure a couple must be pretty good at it.
It'll certainly have a higher roi than paying for picks, I'm 100% certain about that.
But at the same time I doubt the pros would be doing it for a living (there are some in here in the thread so maybe they can chime in????) would ever spend time posting picks so you're likely capped at a talented hobbyist as someone to follow.
What I'd do is first guess what you think the lines will be. Then take a look at the lines and pick the "inefficiencies" ie if you think it's -3 Ari but the actual spread is -1 Ari then you obviously bet ARI.
Only then would I take a look at the accounts you trust in and see where they disagree it agree with you and try to figure out why. That should arm you with enough info to agree or disagree with their conflicting picks.
But realistically, most pros are either building models or doing heavy line shopping so I wouldn't treat this anymore than a hobby unless you're willing to go to those lengths. .
There's a thread here that's a few months old dealing with how to build a model. I'm on my phone but there's not too much volume in this sub so shouldn't be too hard to find. I'd also imagine there may be a thread about how to love shop and if not you could make one. That's something I don't know about myself so if you find one or create one please post the link here so I can lurk