I’m more than happy to debate on semantics if you like, 2222....
In common parlance, the base is only part of the game and does not include offense, beyond the buildings. One does not need to progress the entire game to push trophies, only the portion that affects troops and heroes - specifically the offensive portion of the game. Even if we were to consider offense part of “base” (which I do not) the point does not stand as your definition includes many objects that do not need need to be progressed to push. A L1 defending TH12 with maxed key troops and heroes can push just as effectively as a fully maxed base. As such, only a portion of the game requires progression. Even the offensive buildings do not all need to be upgraded; one could easily upgrade just one Barracks, the laboratory, and Spell Factories. In fact, one could go so far as to leave even resource buildings L1 now, using just Hammers and/or bonus pack resources to upgrade.
I would submit, however, that such an enterprise would be exceedingly tedious....