That's a bad advice. Firstly, Google is known to ban developer accounts "by association". They will easily ban all of your copies all at once. Secondly, apps are identified by globally unique package IDs. If one account has claimed an ID, no other account can use it ever again. So even if you do republish your app, you have no way to make your existing users update to that version. It will be considered a different app both by Google Play and Android itself.
Probably even worse for the advice is that client accounts can be associated with a banned developer's account...I remember reading a dumpster-fire of an ASK HN (a tire fire for the people actually effected).
