In the Staging Ground return post, we were told that the Staging Ground would get questions from first-time askers. However, I saw a few questions from users who asked other questions before.
You can find an example here. This user asked 3 questions before, none of them being closed or with a negative score at the time of writing (all +/- 0). One even weirder question discovered by VLAZ can be found here. This question is asked by a user with >1k reputation who has written multiple questions that have been received well.
Given that other askers seem to be eligible as well, what is the exact criterion for a question to go to the Staging Ground? Can multiple questions from the same user get into the Staging Ground?