it’s possible, but there’s no way of knowing
nobody in their right mind with a consistently working EA is ever going to share, sell, advertise or promote it, that’s for sure
and that’s the reason it can’t ever be possible to give the answer “no” to your question (however much one thinks that’s probably the answer)
lots of people (including many financial institutions) have had long-term success with automated trading software that enters and exits trades on their behalf, on the basis of indicator-patterns, price-action-patterns, or combinations of the two, and books describing and discussing them have been published
but those aren’t “EAs”, because those aren’t people using MT4/5, and they’re not people betting against counterparties rather than trading in a real, transparent market, either - and there’s something to be learned from that
still, it’s a similar kind of thing, based on the same principles, and it at least suggests that it might be possible to do it with an EA (and that fact is what keeps the EA-selling industry going, of course)
if anyone does, you should stop listening to them - that’s for sure
that really isn’t possible, for many reasons
that’s a very big red flag, and an additional reason to be very skeptical about the backtesting outcomes