A). Possibly but if true its clumsily written by Lucas and not really clarified.
B). Entirely plausible Han would brag to two people he thinks might not know better using confusing language.
Yeah, like when Rey is like "I bypassed the [compressor]!" and Han obviously has no clue what she's talking about, or when C3P0 says "I believe that the power coupling on the negative axis has been polarized. I’m afraid you’ll have to replace it" and HAN says, "Well, of course I’ll have to replace it," and then turns to Chewie and whispers to replace it because he had no clue.
I mean if that's the case then why even debate me on it? If your answer is just going to be "well I enjoyed it," that's fine with me, but it was silly to me and I think it was a weakness in the movie.
And this isn't about "plot holes" like the Death Star thing. Those exist in every movie, especially sci-fi. This is about, like you put, stretching my "suspension of disbelief" way beyond what was necessary to achieve the desired effect. You can have and exciting chase scene without, at the same time, temporarily breaking the underlying rules of physics in your world. It actively brought me out of my excitement of watching the movie because it was distractingly out of place for me.
And for the sake of arguement, I disagree with the Death Star being a big plot hole.
(1) Iran is not going to stop trying to get nukes just because the US and Israel have thwarted them in the past. Once they get them going, they are a qualitatively different threat. Same with the death star.
(2) If a huge power source needs an exhaust port to avoid overheating, you can't clog it up. Some imperial general proably said, "Isn't that a weak point," and the engineer replied, "well do you want a billion, trillion megawatt laser or not? The hole is only 2 meters!" They probably concluded that hundreds of tie-fighters and cannons would be an adequate defense. What they weren't counting on was the Force. The mission would have failed without Luke.
(3) The ROJ did not get destroyed in the same manner. It was attacked while it was being built and you could fly right into its core. They flew into it and shot a missile at its power source. It was shielded and well protected, but the Emperor rolled the dice and let them find it in order to lure the Rebellion in because he was--like Snoke--more interested in the force than the weapon. He even delayed the battle to emotionally manipulate Luke. Luke was his prize. (The silliness was in his best troops getting taken out by Ewoks, although I am sure that an R-rated Jedi could have made a jungle full of canibals defeating a legion of Storm Troopers more plausible).