How are DeSantis and Haley moderates? Latter may be nicer in tone, but they all have embraced Trump and the Tea Party's right wing agenda. By no means are they moderate. Even Kasich is conservative on a lot of issues, though calling him a moderate would be much more accurate than the 2 named above.
In the same way that Ted Cruz tried to paint Trump as 'moderate' (or whatever more derogatory term he used). DeSantis becomes more of a moderate because there is no way Kasich or anyone remotely from that vein would win a Republican Presidential primary.