I don’t believe one word of this. As you say, someone at risk has no business teaching kindergarten in the first place. Every teacher knows that you catch everything the first few years. Then you just catch the new stuff.
This is a prank by the national teachers union to close schools. Their tune will change as soon as the election is over.
The election is over over here. Bibi and Gantz will share power. Shalva is dead, and the Teachers’ Union here will make whatever hay they can, but election outcomes are already done. Finally.