William and Catherine have very flexible jobs, unless you believe that they only "work" when they are at public events? A lot of their work - meetings with charities, going through red-boxes, running the Duchy and planning for engagements etc can be done anywhere in the world via internet and Zoom.
It is an odd argument that Charles was criticised for being an absent father and sending William and Harry to boarding school aged 8 (and Harry has been vocal about "generational pain" of his upbringing). But now William is criticised for spending time with his kids while they are primary school age?
It is odd that this narrative is being spread now - almost like talking points.
I don't remember the late Queen being criticised for her 5 months away each year (yes 5 months!) in an age where working from home was much more difficult.
Why are Charles and Camilla not criticised - they spend a lot of time away as well - Sandringham, Balmoral, Highgrove, Birkhall, Castle of Mey, I think he has a holiday home in Wales as well...
Plus Charles spends a week or two in his Romanian properties while Camilla has "me time" separate from Charles at Ray Mill house, sometimes a retreat in India, and this year a Greek cruise on a loaned yacht.