Mullvad doesn't mention a blog post, I think this has been in the works a lot longer than that blog post was.

These servers run from RAM, with fully encrypted disks mounted to store the backend PostgreSQL database. We cannot fully run our servers from RAM due to requiring a persistent database, but that was a trade-off we had to make.

These servers run the same OS and kernel configuration as the rest of our infrastructure that runs from RAM, and we have had this service audited pre-production by Assured AB. The issues found by Assured have since been resolved.

Auditing takes time, as does fixing issues found during audits. This wasn't in response to a blog post. This was because Mullvad is a company that is trying to do right by their customers (a shocker, I know).

That's really great news, and hopefully an inspiration for other companies to follow suit. Tearing the Google email monopoly into smaller pieces bit by bit :)

Just for the record, the other post mentioned by the OP can be found here : https://old.reddit.com/r/mullvadvpn/comments/197a9pd/mullvad_uses_gmail_for_its_support/

What I find kind of strange is that they have used Gmail before. Feels not to be the best decision for a VPN service which offers anonymous access.

Even better that they have switched now.