Fernando Llorente is a striker. Not a defender. The discussion was Conte not trusting his defenders.
That summer we were heavily linked with Sandro, Van Dijk, Bonucci, and Candreva. At the time, all upgrades on defenders/wing backs we currently had, so it was clear Conte didn't trust his defenders.
I think I've been pretty vocal since I've been here how even towards the end of our title winning season, it was clear Alonso and Moses needed to be upgraded on. After the Spurs defeat in January that season, it was really when clubs first figured out how to combat the 343. Put pressure on our wing backs to keep them pinned, and have wingers exploit the space that's between the wing back and the centre back. We didn't have the personal to cope with that, hence the amount of shithousery we saw that 2018 season.