Governments and others do send data for TIMATIC, but it doesn’t mean TIMATIC always gets updated like it should or that airline reps understand or properly use TIMATIC or whatever is put out there by the relevant government authorities.

For when rules change rapidly, my advice is to aim to fly non-stop as much as possible and do so with a flag carrier for the destination country and really know and comply with the latest rules, have those rules documented, and be confident in dealing with the airline reps.