A lot of the strikes and worker dissatisfaction even outside of unions is from inflation. Inflation doesn't hit all parts of the market evenly which allows them to cook numbers and sometimes cost of living adjustments don't properly reflect nor do they reflect quick enough. Some things have almost doubled in price but salaries lag behind.

Negotiating pay in dollars is silly because its not a static unit of value and you are left arguing how to divide things in a world of shifting sand. It just produces conflict which means downtime for the owners, lost work for workers, unfair conditions in the meantime, wasting argument over it when argument could be addressing finer details.

Now gold isn't perfect as a static unit of value, but it's better than the dollar, and can be tracked week to week and even hour to hour. You don't have to wait for an annual inflation metric that is outdated on the day it comes out.

Best yet in introduces what might become a new standard which might benefit all workers. Even those outside of unions. Right now if you interviewed with a private employer and said I want my income pegged to gold they would look at you funny (maybe not because the conditions are so bad I think they'd get it), but they would still say no. But if unions manage to carve that out for themselves now it doesn't seem so weird, and other workers don't have to see their salaries get shaved away before their very eyes and be forced to the negotiating table just to make the same money.

Screw negotiating long term things in dollars. Negotiating in something else can be cumbersome for the other party, but with collective bargaining you can be a bit cumbersome for the sake of doing what's reasonable. That's the point.

Worst case if corporations control the politicians, and corporations have their labor accounting get all screwed up when there is high inflation, maybe it will even make them figure out how to not create this problem in the first place.