Wind Runners Civ Buff - gives Dolphin's Grace in addition to Depth Strider

According to the NPC, one of the civ perks is "Depth Strider when wearing any boots", but you get Dolphin's Grace in addition to depth strider. This can make controlling yourself in water difficult when base-building. On the other hand, this can allow you to swim VERY fast in water (to the point where it looks like you're hacking) and would be OP for escaping fights. A related note, it appears that it MAY not actually give "Depth Strider", rather "+1 Water Movement Efficency"? I am unsure if this stacks with depth strider, would be good to test this. Credit to DrFishy44 for telling me this