He is explaining this because he was caught,but there was no mention this on the announcement,if he is transparent and honest,he will have told us in the first place.
Honesty is still the best policy.
He definitely did say this when the change was released, that it will become effective after block 5000. It couldn't really happen immediately because the network had to upgrade. Now we're at block 4039 and still 41% of network is on old version:
https://chainz.cryptoid.info/zoi/#!networkWill this split the network in 2 after block 5000? Everyone should upgrade I think to keep the network together. Or we'll end up with 2 block chains. Get on it friends.