There's a difference between impeachment and conviction. Pelosi resisted impeaching Trump over Ukraine because she could do the math. However, the new radical lefties elected in the 2018 Mid-terms* pushed her into it with the threat of losing her Speaker position.
I expect the same will happen this time around on the Republican side. McCarthy is already downplaying impeachment for the same reason as Pelosi: they don't have the numbers. However, with all the RW wackadoodles being elected, all screaming for Biden's impeachment, I suspect he'll succumb to their demands by Spring/Summer.
*the irony being it was done with Trump's help as he got rid of anyone opposing him. Note that the Democrats may have shot themselves in the foot by supporting RW election deniers and now facing the prospect of seeing those idiots elected to Congress.
That there's a difference between them is the point of the post you quoted. The other difference is in the nature of the evidence against Biden as compared to that against Trump, and that difference is large indeed, which even
some Republicans understand whether or not they will openly concede it. Also, at least some Republicans will understand that a Biden impeachment will appear to the public to be exactly what it is - a cheap minded payback.