Please read the Discord official post.

one to access teen spaces,

That account will be tagged as a teen account until proven otherwise. Therefore any message or DM he will receive will go to a special inbox with most likely warnings to consult it.

Please, again, I understand that the pitchforks are out for discord, I'm just asking you to take the time to read the official discord post from top to bottom.

There will still be unknowns until they release the update but your question is already answered by their official post.

Basically, as long as an account hasn't done an age verification it's assumed to be a teen. And that means all the limitations attached to that. So you can create 10 accounts if you want either :

• You have proven you are an adult on that account you remove the limitations to what you can do but your messages towards teen accounts will most likely go to that special inbox they mention. No clue exactly how hidden and how much warning are attached to that inbox.

• You have no proven your age and your account is limited like any other teens account. You won't be able to see "sensitive media" whatever Discord means by that I dont know.

What I really wonder is what they will allow in term of interactions between the two groups in details. They are very vague on many aspects of it.

But multiplying your accounts on discord doesn't look like a valid workaround to their system.