Flutter is a ( viable ) technology that’s being growing for the last few years. A very significant percentage of new mobile apps are programmed with it these days.
It seems his problems have everything to do with the local job market and not the technology. With the added bonus that you can be a single man operation and release your own apps for both iOS, Android and the desktops.
I’m not a fanboy and even less of Google but Flutter really offers the ability to make lemonade if the job market gives you lemons.