Display MoreBut he was already 20 years at the start of the 06/07 season?
Normally, "youth"-teams are under19-teams, and with 19 years players are promoted to senior teams. Of course, not everybody make it, and some countries/clubs have u23- or other kind of reserve-teams. Often, it's a mixture of both, a 19-year old gets promoted to the senior team, but sees only a handful of league appearances, mostly as entering sub gaining not much playing time, so he gets his playing time in the u23-reserve-team. But also youth players from the under19 or even under17-teams can get their chances in the senior team, as bench player in the 2nd Cup round, or late in the season when results aren't that important anymore for "mid-table" clubs, and so they may give their best 17, 16 or may even 15 year old youngsters a place on the bench and may even some playing minutes.
So coming back to the Jounaidi case. Your source says he was "احد ابرز اكتشافات الموسم" so he performed well enough to get picked for the Olympic team. That doesn't mean he didn't played at all the previous season 05/06. Maybe he just got a couple of league appearances or even bench nominations in 05/06? And maybe he got his first matchday nomination earlier, for example as 16 year old at the end of the 01/02 season.
I understand your point, that by googling now, you can just verify the 06/07 season at the earliest. But other users have made their research, too when editing his club career, based on sources we may not found now as they went offline. Maybe the sources were less reliable or mixing youth and senior teams. But it was research done. So, I wouldn't delete his early club career. Though I understand you that he may has less than 10 league appearances from 01/02 to 05/06.
The overall problem here, is that we don't have Lebanese league stats. What we actually need are proper league stats for the full squads, by which we can see all league stats of the entire squad, so we could see how many games a player really played. If he didn't appeared on such a full squad stat list, not even as unused bench player, I would agree to put him out in the season before he appears the first time.
He just left Ansar today. This Kooora source (https://www.kooora.com/?n=1154382) says that he left the club after over 21 years, which means that he joined in 2001. However, it specifies that he climbed the ladder of the youth teams, and then reached the first team. I think someone might have seen that he "began" in 2001, though this is the date he joined their youth team. I think the most likely year is somewhere in the range of 2003-2005 (as a 17-19 year old), though without a source it's difficult to be sure.