No question mark.
The reason he took down the "scope" tweet is that anyone who is getting their knee scoped is getting it repaired in some fashion. MRIs do the diagnostic work, there’s (typically) no such thing as exploratory knee surgery/scoping.
By confirming that he was indeed getting scoped, he was confirming the alleged injury, which is something we don’t do so he took it down.
Now eight hours later he threw the above tweet out there. Maybe it wasn’t a complete tear, maybe he’s trying to keep the mystery alive for OU, maybe it was a Maniscal tear and he’ll be out 3 months instead of 12.
But it wasn't. Reconfirmed, ACL injury.