In other words this is “Warp 4” in Star Trek speak
Maybe; I seem to recall that the definition of 'warp' changed between TOS and TNG, certainly in Voyager.
Reason: I recall the Enterprise in TOS being hit with an energy wave traveling "Warp 20".
In TNG I don't recall any 10+ Warp speed (off the top of my head).
In Voyager they explicitly state there's a Warp 10 speed-limit, with 10 being equal to infinite speed.