For the same reason they speak in reverence of Martin Luther King Jr. and pretend that liberals didn't hate his guts back in the day.
On a long enough time scale the left always wins, and liberals always pretend that they backed the left the whole time and claim the victory for themselves.
"A liberal is someone who opposes every war except the current war and supports all civil rights movements except the one that’s going on right now."
The filibuster literally can't be used on a reconciliation bill. It's just not a thing. Democrats used other Senate rules to effectively filibuster the bill by forcing a full reading on the Senate floor. It's not as effective as a filibuster, but it served the same purpose.
I'm sorry, but I just can't take your demands of Democrats seriously when you can't bother to even RTFA to understand what you're demanding. And this is from someone who lothes the neoliberal establishment and especially Schumer. I'm entirely in your corner on the temporary budget, but that was not part of your previous comment or my response.