Is Mojang account deleted after migration?

You might lose your Minecraft account unless you act now

New Minecraft Account Migration Deadline Date Revealed

The Java Account Migration Deadline

I'm trying to post migrate my account but it keeps saying this

Minecraft Players Will Lose Access If They Don't Migrate Accounts

FORΞST🌲 on X: Hello, @notch I just wanted to say, that migration

ClubMinePenguin Development (@CMPDev) / X

Love Minecraft: Java? You'll have to learn to love your Microsoft

Announcing a change that requires a Microsoft account to play

How to Migrate Your Account from Mojang to Microsoft The Sandlot - A Family-Friendly Minecraft Community