Earlier quoted context omitted.
But lack of personnel to do jobs would bump the wages due to demand and that would quickly find people ready to fill them in
And bumped wages means higher costs which are passed on to customers. The higher prices means having to raise UBI, and the only way to afford that is by increasing taxes, and so effective take home pay from those bumped wages isn't as high as everyone thought and now we're back to square one.
The wage earners would be paying more taxes due to their higher wages.
The wage earners would have more spending power in our real economy, which both means more businesses earning money, and more tax revenue collected.
Is there a threshold we could hit where wage increases, increase cost to the point of outpacing tax revenues, sure. Is this even close to a default outcome. Absolutely not, and it's absurd to suggest it.