No is not a universe infinite. In that comic it is also Said that all that is in asgard is now on the Earth. So not infinite in doctor strange this is a pocket universe also confirmed by encyclopedia
This is a map of all realms, apart Earth
The gods are born from.the biosphere of the Earth so they not created the Earth but earyh created them
You understand what you are doing is denying vegeta was a planet by saying "vegeta is less than 6 feet tall according to his bio and planets aren't that old"
The map you're showing is of Asgard, the city. The realm itself is also called asgard. The first one obviously isn't universe sized, what the thread is referring to is the second.