There was a cut line about Varric telling Hawke, "Don't worry, I left out the part about us..." It was cut and so non-canon, but I find it interesting that it was considered, a long with whoever told me they regretted in hindsight not making him a LI.
Of course, if he had been a LI, the possibility here would be nil.
No, there was no such cut line. That's something a bunch of fans came up with.
Just because questionable speculation was right in that case doesn't mean that it strengthens other questionable speculation. If a student tries to answer a math question and does the "work" wrong, but gets the right answer because of a random computation error, that doesn't mean that they are more likely to get the next question right too.
Alternatively, if throw away lines suggest a companion has a specific preference, perhaps we shouldn't ignore them just because we don't like what that suggests.