Yeah, partially true... Major Teams are given a certain number of spots, this year I think between 3 to 6, but not certain. It's up to the team manager who is given these spots.
I think the "early" sign-up link is different than the "regular" link, and the number of the early link was capped to the spots offered prior to general entry. So yes, if one were to look after these spots are all filled, it wouldn't show available.
I'm not a lawyer and I don't play one on TV. But I do know two shooters that signed up at the bell the first morning of regular availability and got into all events. And I talked to a few shooters at the Utah EFT GP event this past weekend that also signed up at the bell and got into all events. So obviously it wasn't waiting list only the day prior... I got into all events at EBR and RMAC in 2018 and 2019 by being ready at my laptop the minute general entry was opened...
Also, there were 21 (plus about 5 added later for the Utah EFT GP) that were awarded early sign up for performance at the EFT GP events throughout the year. It was top 5 shooters or top 20% (whichever is greater) at each of the EFT GP events.
I do not know which Teams were offered early sign in, nor how many per team. My Team had 6 earn their way in with top 5 finishes at an EFT GP event, and another 5 as a Team entry from our Sponsor - Airguns of Arizona.