Yea I think you summarized Yang's position well. I'd assume your answer to the question is no?
The Democratic Party appears to me to be split. The clear moderate or "centrist" in the Dems' 2020 race is supposedly Joe Biden. He's an establishment guy and senior statesman. The DNC appeared to be promoting him as their most electable candidate earlier in the summer, but he lacks energy, charisma or much originality. Many of the Democrats are just not warming up to him. (It doesn't help that he looks like he's about to fall over and he can barely complete sentences when he speaks.) There were other moderates among second-tier and third-tier candidates, like Amy Kobuchar, John Delaney and Steve Bullock, but they haven't gotten traction. They've polled at 1% or less.
Meanwhile, the energy behind the party is really on the left with Sanders and Warren. The dilemma is that the lefties who appeal to the Democratic base enough to win the nomination may be too progressive (or even radical) to win over moderates and independents in a general election. The ideas like universal healthcare, tuition forgiveness, nationalizing energy production, etc. are probably too costly and impractical to pass the Senate, and probably the House as well. So in reality, these may turn out to be empty promises. I'm not sure if Yang's plan of giving every American $12,000 per year in base income is feasible either. That sounds like the western world's biggest welfare program to me.
Dems are hoping that there is enough universal contempt for Trump that it won't matter, and that they can push their candidate through (probably Warren). Personally, I think that is a very risky play, but they've pushed their chips to the middle of the table with this impeachment inquiry. The impeachment proceedings, if they go forward, will likely bring more attention to Joe Biden and his family's corruption than Ukraine ever could have. Republicans will have a field day. Biden was already showing weakness. See if he's still among the top 3 or 4 candidates 60 days from now.
So no, I don't think the Dems will ultimately put through a moderate candidate. That's not what the Dem base seems to want.