Could be they want to avoid what we are seeing out of Israel or it might jolt the sheep from their zombie slumber. Killing off the old won't alarm anyone to the boosters, then they'll promote it to the rest of the population while blaming the die off of the elderly on a new "covid strain" even though it was the boosters. Considering this was their play when it all started, looks like they feel safe continuing with the play that worked for them.