Spose so, I guess it depends whether you consider logging on/off a valid mechanism, or part of the "game".
It's hard to reconcile that it's not when you look at things like Guardian Blueprints where (presumably) you're expected to fly up in the air (out of the instance) and back down to get another blueprint.
Or Dav's hope where you're supposed(?) to fly into space and back down where stuff magically reappears, or if you're there in open switch to solo cos someone took all the stuff.
As far as I am concerned, if my CMDR, existing wholly within the game, couldn't pull it off, it's not a legitimate tactic for me to use as a player.
This means I do not mode switch, board flip, sever connection, log off, or even reinstance too frequently, with the intent of manipulating the functionality of the game to my CMDR's advantage, as these are all blatantly out-of-character actions that have zero context within the game's setting.
I even go so far as to avoid most 3rd party tools, though I can see how such information would spread to my character via various means that are not explicitly detailed in-game, and do not consider such information abuse.
My CMDR has been in three Dav's Hope instances, total, with months of time between them and sees no reason to go back as he's operating under the logical assumption that Dav's Hope has already been looted and that no one would be replacing materials specifically for him to steal.
Likewise, my CMDR has no Guardian equipment, mostly because he thinks the effort/reward ratio will be poor if he has to visit countless ruins to gather the materials for a single piece of tech.
Fortunately for my real-life entertainment, none of these things are remotely required for the game to be enjoyable, or for my CMDR to be competitive in non-BGS-influencing scenarios.
I suspect you could compare it to save-scumming in something like Doom, it's technically outside of the game but it's actually there in the game. I can be "abused" depending on how you want to define that, but in the end it's just a game so who cares anyway a player is just leveraging a "feature" to make the game more "fun" (by their criteria).
The distinction between what Doom Guy(TM) is doing (killing demons) and what I'm doing (manipulating game menus, and DoomGuy) is quite clear.
However, I have no issue with 'save-scumming' in single-player games because the player, perforce, makes all the rules where they are the only player, nor can one cheat in a single player game as there is no victim to be cheated. Such is not the case in multi-player only titles that have shared elements than anyone can, and nearly every does, influence.