Good question. Are they people against the H1B Visas also the ones for Trumps immigration policies?
Nah, its a terrible question, only made less terrible relative to your even more terrible question.
Trump's immigration policies target people by race and religion, and his efforts to mask this objective fact doesn't make it any less the case. Opposing H1-B visas is not intended to, nor does it have net harm primarily against a particular racial or religious group.
In fact, the whole purpose of such Visas is to benefit the employers by harming US workers, which include members of all racial groups. Any benefit to foreigners is inconsistent and incidental. Also, H1-B visas benefit mostly the richest and largest corporations who have immigration attorneys on full time staff, who are needed to file the applications and craft the lies about market need and wages in a way that cover the employers ass. That is why all non-racists and also all those who value secularism oppose Trump's immigration policies, but they might oppose H1-B visas.
As to what makes H1-B visas more harmful to wage depression, the simple answer is that H1-B visas are specifically designed to suppress wages. They are given to people whose entry into the US will be sure to suppress wages in particular fields where wages are not already low due to other factors. The majority of immigrants (both legal and illegal) wind up in jobs that are already relatively low paying. Also, immigrants are free to quite their current job due to mistreatment. H1-B visa holders are completely under the thumb of their current employer, even moreso than illegal immigrants. Illegals can and do change jobs all the time. H1-B workers are "on the grid" and the second they quit it triggers a deportation process. And wage depression cannot be assessed merely by the numbers on the paystubs of workers, because wage levels are inherently relative to amount of work required. Employers can and do depress wages not merely by lower annual salaries but by requiring many additional work hours for any salary level, and the H1-B worker has no recourse other than to leave the country.