By saying Wieskamp has a chance to be an NBA player, that was short-hand for stating that I think he can have a long, legitimate, ~10-year NBA career. Most second round picks at least get a cup of coffee these days, especially with COVID rules expanding rosters even further (two-way deals and the fact that second rounders don't count as much against the lux tax as other players signed to a minimum deal).
Looking at the 2010 draft, there's one second rounder still in the league (Hassan Whiteside at #33). The 2011 draft has two: Bojan Bogdanovic at #31 and E'Twaun Moore #55. 2012 has ~5 players still in the league after 9 years, while the 2013 has only two (Mike Muscala and James Ennis) in the league after eight years.
So that's ten players total in the four second rounds. 10/120 = 8% chance of a second round pick in that era having a long NBA career. I'm giving Wieskamp a 10-15% chance of joining that group -- which doesn't sound like amazing odds but it's almost double the odds of a random second round pick. Moreover, most second rounders that make it are drafted near the top of the second round and, IIRC, players drafted past pick 40 have like a 5% chance of becoming NBA lifers -- so I'm pretty high on Wieskamp given his actual odds.