Looking over those sections, it's not explicitly stated because the rules don't make the distinction you are making between bombs and what are, in rules terms, other bombs but aren't thought of that way by players. TAG and RL are both implicitly referred to as bombs on page 246 and described as taking up bomb space. All that fancy stuff in TO is in a section called "Bomb Munitions" on page 357. They're all bombs. It's a case where the dictionary definitions and the rules terminology don't intersect neatly.
I'll make an errata entry along the lines of "All items on bomb hardpoints are treated as bombs in all respects unless otherwise noted", because that's how the rules work and are meant to be read.
Also, as this question doesn't belong here, I"ll be moving it to TW or TO rather soon. Thanks.