I'm not sure what a forbes link from 9 months ago from someone with no special knowledge of the investigation is supposed to prove.
Whether the dossier is true and who funded the dossier are separate issues, period. It was already common knowledge that Fusion GPS's research was initially funded by anti-Trump Republicans and only picked up by Democrats later, after Trump won the nomination. Absolutely nothing is changed by the knowledge that the Hillary Clinton campaign / DNC were involved in the funding.
Republicans / conservatives are using this to muddy the waters, to make it seem as though both sides are "equally wrong" and therefore no one can be investigated. That isn't how it works. On one hand, even if it were the case that Hillary Clinton were just as guilty as Trump likely is, it wouldn't change the fact that Trump is the President of the United States, and should be removed and impeached if he colluded with a foreign government to win an election. On the other hand, what the Hillary campaign is being accused of here is not wrong or equivalent to what the Trump campaign is accused of. Dems funding opp research is not equivalent to the Trump campaign, including Donald Trump himself, being agents for the Kremlin.