Technically the Internet runs on "the Internet Protocol Suite" but people just say "TCP/IP" for short. That doesn't mean to exclude UDP, SCTP, or whatever.
He means the Internet runs on the Internet Protocol Suite and not the "superior" OSI Protocol Suite (that people under age 50 have never heard of because it failed).
And because of that, badly reinvented mostly through HTTP
The OSI model still gets taught in networking classes to people in their teens and 20s.
That was baffling a quarter of a century ago and it's even more baffling now.