We've arrived at lexical analysis. An inevitability to it. But we can do it together.
From your quoted section:
and given that you can not select the unit (even though when the game thinks you can, but can't)
Background: when stingers with attached units are in carriers, the stinger can still be highlighted from outside the carrier as though it could be selected (but it can't be selected). You can test this for yourself or look at the photo Jip posted as an example.
"The unit" in the paragraph in question refers to a unit which "the game thinks you can [select], but can't". The next sentence in the paragraph (that you omitted) refers to "the cargo of the unit".
The unit is a stinger, carrying another unit, inside a carrier. As a context clue, the introductory section of that post (after the, you know, other stuff) mentions the engine being unable to properly process transports-within-transports or transports-within-cargo.
From Jip's earlier comments, some five days prior:
Being able to give constant stealth a CZAR because of this glitch can hardly be considered intended
The interaction being discussed is clearly unintended. No other unit that enters the Atlantis has this bug for example, except for Stingers with cargo
Zero interest in belaboring this point further.
So. Is there a pot of gold for me at the end of this rainbow? I don't think you understood the point I was making before. It seems you also didn't understand the section you quoted to refute that point (that you didn't understand). You can't claim in good faith that I haven't articulated my arguments. Your MO is heavy on gotchas and it's diminishing my desire to continue this conversation. Where do we go from here?