That's a very dishonest distortion of statistics.
Are you saying that it's "dishonest" to estimate that at least 1% of them are grandparents involved in childcare? By napkin math this more than works out; I'll also hint that if you spend even a minute researching, the stats on how many of these people are likely to be grandparents, and how many grandparents are child carers, are readily findable. If you care to engage in an honest discussion.
The bigger point being that childcare expectations were thoroughly disrupted and folk were thrust into it, rather than planning. Coupled with the "will they won't they" come back to work dates, it's made it not super incentivizing for those of us who could afford to figure out better long term options chose not to. Ex. If you knew it was going to be two years before you were expected back in office, moving closer to family might have made sense. Or setting up a home office. Or any number of things to better our home productivity.