Seems the guy in that thread has moved from an old package structure to a new package structure, and lost F1 because of it. His issue is that he was told nothing would go, not that they have randomly just removed F1.
If you are on a package, you will stay on that package until you change it. My parents recently changes their Sky packages from something they signed up to 10 years ago. The packages they were on were long gone, but they were still on them.
Basically, if you have F1 now and don't change anything, you will keep F1. If you change any of your package you fall into their new structure and will loose F1 unless you have Sports.
This is not new, this is how it was explained when they first shuffled the packages about.