If a droid mentioning Obi Wan by name doesn’t jog his memory, nothing else will. I’m surprised he didn’t sneak down to the garage, and yank their batteries out. 😉
Of course Obi Wan doesn’t recognize the droids either, or is playing dumb.
Well as far as 3-PO saying Obi-Wan, I assumed that Owen just doesn’t want Luke hanging around Obi-Wan.
Also doesn’t he tell Luke to have their memories wiped?
“That’ll be the end of it. They belong to us now”.
That points to the fact that yes, 3-PO saying Obi Wan jogged his memory, BUT what he decided to do about it was just hit reset on the droids.
And nothing confirms that Obi Wan doesn’t remember R2.