When I did the interview early in 2019:
Group exercise - build a lego model as a team
Group exercise - discuss various topics as a group in front of assessors
Some people got dropped at this stage
Interview - Two pilots, one HR. Some of the usual HR competency-type questions, "soft" technical questions from the pilots (mostly CRM-type stuff).
Some people then got invited to the sim in the afternoon, most didn't. It may be that some candidates got invited back to the sim at a later date, I don't know as I wasn't .....
Sim used was a 737.
No charge for the assessment. Group exercises in the morning, interviews and sims in the afternoon. Once you had finished your interview the brief was "don't go anywhere, we will call you before 5pm if we want you in the sim". I didn't get a call so went home. Got an email a couple of months later saying "no thanks".