A blocked shot could be on or off target.The BBC have the 1st half measures (on/off target, blocked) as : 1/6/7.
If by "blocked" they mean an on-target attempt
that the opposition deflects into being off-target,
then the on-target measure would be 8.
A SoT is a shot which would be a goal but for a save/block/deflection
Absolutely ludicrous.