NBL1 is not a league for NBL players. The NBL is a league for NBL players. What a stupid comment.
These are the NBL1 2019 players who played in NBL 2019/20:
ADE: Ben Ayre (Nunawading)
BNE: Nil
CNS: Tad Dufelmeier (Hobart)
ILL: Angus Glover (COE), Sam Froling (Dandenong), Lachlan Dent (NW Tasmania)
MEL: Sam McDaniel (Sandringham), David Barlow (Sandringham), Sam Short (Ballarat), Jack Purchase (Melbourne), Dillon Stith (BIG V - McKinnon)
NZB: Nil
PER: Majok Majok (Perth), Tohi Smith-Milner (Kilsyth), Nic Pozoglou (Melbourne)
SEM: Daniel Trist (Frankston), Deng Acuoth (Ballarat), Dane Pineau (Melbourne), Geremy McKay (Eltham), William Hickey (Melbourne)
SYD: Kuany Kuany (Ballarat), Lucas Walker (Nunawading)
That's 19 players out of 269 NBL1 2019 players and one in BIG V. Nearly half are DPs and two players were NBL starters in 2019. Not sure why people think that NBL1 was teaming with high-end NBL players.
(It is possible I missed some, but my point stands...)