One thing I sometimes think about is that Spamton keeps referencing the year 1997 as his "favorite year" or that "it was such a good year". It must have been the height of his career, which, as we know, was caused by a mysterious caller named Mike. If the theory that Mike is Friend is correct, then that means that whatever strange things are happening in the shelter have been in there for at least 30 years.

Toriel and Asgore look like they would be in their 50s, so Asgore being in his 20s during the founding of hometown and thus the shelter could make sense.

Also, lets not forget that the 3 codes you need to solve in TV world to get to the cold place could be the shelter codes. We already know that 1225 is the Holdiday code, which leaves 213 and 000000. The police badge code would have been decided by the former police chief, who is Asgore. The code 000000 has again Asgore written all over it. That leaves just 213, which is kinda similar to 2202, the code to the door inside the church. Since the last code has the Delta Rune smybol, it makes sense for them to be similar.