Doesn't fly. They clearly were able to have "slow" and a black line border around one and the caution bars with the a pictograph representing "under construction" around the other one. A yield sign is not just a upside down red triangle. It has a white field with the word "yield" on it. And when it is represented by only a triangle it's either white or yellow.
The upside down red triangle has a specific meaning and we did nazi that coming.
Also of note though maybe a bit conspiratorial is the fact that the ads with this symbol
ran 88 times on social media and there are 14 words (counting "far-left" as a single word) in the first sentence which could be a reference to the Nazi 14/88 numerology.