Yes, PGP is dead but not because of any of the reasons this article points out.

It's dead for a very simple reason: it's really hard to find active PGP/GPG keyservers.

Fedora keyserver? Dead

Debian keyserver? Dead

openSUSE keyserver? Dead

SKS keyserver pool? Dead

keys.gnupg.net? Dead

keys.openpgp.org? Half-dead (HKPS access not working, it seems only web is working) etc

Very few keyservers are still online and some of then don't sync with the others (e. g. keyserver.pgp.com).