If something is being done to undermine your value in a market then you are being underpaid.
One could argue that if something is being done to lessen - or raise - your value in the market, then that's just the market at work.
One could also argue that the "baseline" with regards to immigration would be "free borders" and anything else is an artificial deviation from that "baseline." In other words, if NOT allowing anyone and everyone on the planet to move about freely and compete in your industry in your city causes your wages to be higher than they would be if there were no such limits, then your wages are "artificially high."
Likewise, one could argue a complete protectionist labor force, where any labor from outside the country would be taxed enough so that the company hiring them would automatically be paying more than they would for even the most expensive domestic applicant and the "baseline" would be "set" by supply-and-demand accordingly. If you are being paid less than this amount due to a less-protectionist legal regime, you could argue that your wages are "artificially low."
I'm not going to claim that either argument is more logical than the other.