They are wrong, there are actions you can take in git that will cause you to lose your "immutable" history. Most accidental cases probably involve `git reset` or `git rebase`, but here's an example if you want to do it intentionally:
# Commit all changes and push to at least one remote so your changes are ""immutable""
rm -rf myrepo/
mkdir example && cd example
git init
# Repeat for each remote
git remote add remote1 https://origin.for/your/repo
git push remote1 --mirror --force
Congrats, you've lost everything! (Except for your backups, you do have backups right?)
`git reset` and `git rebase` will not lose anything that you have commited before. And force-deleting the remote stored repo is cheating (and prevented by default in quite a few services).
