Your comment looks troll-like, but I will bite.
One of the definitions of propaganda is "information, especially of a biased or misleading nature, used to promote a political cause or point of view."
In this situation is "information used to promote a political cause", the cause being anti-migration. You may say it is only for the "illegals" but currently in the US anything appears to be illegal (see the case of the german backpackers).
The expectation is for governments to work together for such spots, the fact that the US bypassed the Mexican government and contacted directly the mexican media companies is a huge red flag. It was not any American person, it was the US government.
The Visit Mexico ads are definitely propaganda, the word itself is a synonym of advertisement, but bening propaganda and displays a good relationship between Mexico and the United States, that is why you don't hear backlash from it. Like I mentioned before the anti-migration message could have been agreed with the Mexican government.
You are framing your position on the fact that the mexican government position is incendiary or pissy, but the same can be said from the US ads, which are unprofessional, unprompted and unexpected, making them incendiary and pissy. Thus making them toxic propaganda.