I've been reporting illogical and apparently unintended game mechanism surrounding missions and instancing persistence exploits going as far back as I can remember. I filed bug reports, with attached videos for the initial Sothis long-range missions, 'Seeking Luxuries', and the original use of capital ships + turrets in CZ to automatically accrue combat bonds.
This was back when a few million cr an hour was an anomaly and the most expensive vessel my CMDR could afford was an Asp.
I never used the ladder you are referring to. It's rungs were always clear exploits based around the abuse of non-nonsensical mechanisms providing handouts that were never good gameplay and were always harmful.
Your career in BGS manipulation started the first time you logged in and had your CMDR trade a commodity, kill an NPC, or take a mission. You don't need to have any intent, or even awareness of what you're doing, to have a very tangible impact on the BGS.
There is a constant tide of BGS activity that is driven by relative in-game rewards, and mechanisms that can be used or abused to game those systems have a major impact on BGS inertia.
No, I don't know what you mean because I find the data presented, in the context it was presented in, to be entirely plausible.
I'm not sure a figure covering a wider time period would be any more useful. They are likely far more concerned with the general prevalence of board flipping rather than the proportion of players that have ever done it at some point.
The fix for this was rather hamfisted.
Each faction should only ever be giving a single mission to scan the same terminal at a time and missions from separate factions to scan one terminal should all complete simultaneously.
As it stands now you can take a stack of these missions, re-instance, and scan the same target repeatedly to complete multiple copies of the same mission for the same people, which is flatly absurd. Anything that requires or incentivises reinstancing is silly and broken.