Yes, like all other canton you can have 5 accounts for your 3a in 5 differents provider if you want. The problem was more about the withdrawal. I asked for a precision and give them an example but they were not or can not answered if 5 withdrawals over 5 years could be considered as tax evasion.
In my opinion: no because in order to do that you have to not declare something that is part of your income and by withdrawing a 3a account you are taxed so the Tax department will know it in your tax declaration of the year.
I don’t know why this « rumor » exist in the Canton de Vaud…