From the chart it looks like all the main parties in the DSA are fairly conservative?
That's from their perspective...and I would note that conservative here should not be construed as having the same policies as conservative in the US.
On this political compass, the terms mean what they say and say what them mean.
So the spectrum on the horizontal axis would be:
Radical (aka revolutionary)
Progressive (seeks added innovation)
Moderate (sees value in some changes, but also in keeping some things)
Conservative (seeks to keep things the same)
Reactionary (seeks to change back to earlier things)
Now the thing to remember here is that overall, compared to OTL, this world has traditionally valued more classical liberalism/humanism.
On the vertical axis:
Centralized (big unitary government, interventionist, big business)
Federalist (strong federation, moderate business)
Moderate (values some bigger governance but also strong local autonomy)
Confederationist (loose unity, more local autonomy)
Decentralized (small government, local rule, small business)