The study referenced in the link shows a very clear trend line showing the relationship between IQ level and income.
The study doesn't show the actual scatter plot of data that the trend line is derived from. (Second picture) Nor does it show an R-Sqr for the regression (probably because it would be ludicrous).
It was nevertheless published and has been cited repeatedly.
Link: https://twitter.com/EmersonSpartz/status/1297944261896204289?t=O-WbvYV5dw7ezd8-_aI-Jg&s=19