None of that is impeachable offenses -even if they were true-. Let alone having it block a SCOTUS nominee. The President doesn't stop being the president just because he is undergoing impeachment proceedings.
Now, normally, a President ongoing impeachment would have the obvious block of the senate saying "No, not until after the proceedings". Here's the thing though, there is nothing constitutionally, procedurally, or legally that... actually says they have to do that. Its just basic, common sense for when everything is normal.
There is absolutely nothing stopping them making things business as usual while such proceedings are going on.
Right, side rant. I have repeatedly brought up that the democrats are fucking idiots. Every time they tried to go after Trump they threw in BIG GUNS. Their military support with the impeachment was one as was the impeachment itself. Rape allegations with Kavanaugh. Bring up dirt on Trump like the pussy tape or attacking his allies. But... they have always done so to back up the weakest, flimsiest of cases and led to them getting nothing for the cost. They can never use those shells again. One use, makes a boom, then never again.
It has officially come back to bite them.
They could have done rape allegations, but they blew them on Kavanaugh in a bid to stop him... a foolish use because even if they sunk him, Trump would have nominated someone else who would have gotten through.
They could do impeachment proceedings, but they did that once and it was based off hot air. They could impeach him 100 times, and not one would have the same impact.
They could get the military upper brass to say they'd prefer a delay, leaning on our respect for the military. But they had them come out when it was obvious impeachment was failing and that resulted in said upper brass being demoted, ousted, or otherwise silenced.
They could have threatened riots, but they are already doing that with full support from the democrat establishment.
I could go on, but you get the picture. They fired every shell they could have launched and... for absolutely no gain. Now, when any of these might have worked to at least delay something legitimately devastating to them, when they need ammo the most... they found they have used everything.
Idiots.