Unless Nicholas wants to comment on the original intent, we are just interpreting what it says. My feeling is that the list says training package spell lists because these lists are coming from a training package and, for purposes of calculating the cost of the TP, one must make some kind of assumption about the class of spell so it can have a defined cost. But as you note, most TP spell lists are linked to particular TPs which explicitly bars them here, and the explanatory text says "those normally available" which it seems to me rules out every other TP spell list too. Therefore the interpretation that they must be TP spell lists doesn't make a lot of sense, and what you are left with is the non-TP spell lists that a character can normally buy. That's my interpretation and why, but you can draw your own conclusions.
