That’s possible, but the agitation for a new lockdown has been going on for several weeks and appears to be entirely political. It seems that they had to vote on the order in the Knesset, and it was consistently losing, but somehow they got it through this time.
I don’t know a huge amount about Israeli politics, so I’m not even sure what the sides are. But I honestly don’t think there’s anything else behind it, or they would have acted more rapidly.
The final decision was made by the Netanyahu cabinet not the Knesset.
“Cabinet Approves Three-week Lockdown Starting Friday”
https://www.haaretz.com/israel-news/coronavirus-covid-israel-west-bank-gaza-updates-lockdown-1.9150906