Pretty much what was said above. I am not claiming they are equal to smt characters, but that you can't dismiss feats or statements that would make somebody infinite or immeasurable based on the viewers perspective of them fighting at finite speeds, which is what was being done as reasoning for ignoring there feats/statements. smt and digimon were just examples of verses that usually are shown in what we would see as the viewer in finite speed in combat, but in reality there few statements and feats dictate they are not actually bound by linear time.
As for Demigra being infinite/immeasurable, he literally lives in the crack of time for 75 million years in relation to the kai of time's perspective, a place devoid of time and outside the flow of time and even multiverse, and can not only effect things and move around in there, but also even effect things from within such a place that are in the multiverse and in the flow of time to. So naturally existing and living in, and manipulating a place outside of time would be either infinite or immeasurable speed, especially when you can effect beyond it into the timelines to from that place.
Also the masters are shown to be able to fly through time and even across timelines to in order to reach you at times when your in danger, and split as well to go back to the time nest if beaten up, so travel through time by flight and not hax both forward, backward and across separate time spaces even would be immeasurable speed to.
And then you get to the transcending time statements, which by themselves could be interpreted as an exaggeration or literal, but since they can literally live in places devoid of time and travel across time in any direction with regular flight, the quotes become substantiation for the feats, as opposed to just unsubstantiated quotes.
Anyhow, that is how I and many others see it and the reasoning behind it. You may or may not agree but everybody is entitled to their point of view.