I searched and could not find. If already discussed, please delete and kick me in the right direction

I didn't read the in-game info about Mobile at lvl4 and am stuck with the fexwiki entry which I find ambiguous.
Your speed increases. When you use the Dash action, difficult terrain doesn't slow you down. Moreover, if you move after making a melee attack, you don't provoke an opportunity attack from your target.I have no issues with
"When you use the Dash ... " or
"you don't provoke an opportunity attack from your target ... ", even if the wording of the latter does not rule AoP from NON-TARGETS (I've played WFB/WH40K and I know a lot about poor wording of rules and RAW arguments ... :().
I'm confused by "Your speed increases" - is that "pure fluff" or does it raise Racial Speed? The Smol Races move 9m? Others boosted to 10,5m? Wood (Half) Elves move 12m?