Honestly, the explanation may be even simpler again.
This pyramid dates back 1800 years, but 2200 years ago China's first emperor had his own tomb built, and whilst it has not been excavated it is long rumoured to have been filled with rivers of mercury, and of course, jade, which is common in China.
So as much as we like to pretend otherwise in many Western history books it's feasible that there was, in the intervening 400 years, some knowledge transfer and trade from China to Mexico, and that this Mexican pyramid was simply built to mirror this one in China that is similarly pyramid shaped, filled with mercury, and full of jade.
Of course, I believe the oldest pyramids we know are perhaps the most famous ones in Egypt dating back even further, so this may all simply represent an eastwards spreading of that kind of style of tomb over a few centuries of human civilisation. I can quite imagine travellers being so mesmerised by these massive constructions full of jade, liquid mercury and other such things that they may want to replicate them upon returning home or reaching new lands.