So, a few things that I feel like pointing out.
This was expressly built to compliment the U-1, which is linked in the article and happens to be a 25 ADR hull, 25 SP 5 (5 threshhold) 'variable fighter' ala Macross.
Usually, it's .27c in its frame form and .32 in fighter form, which I think is a pretty good sweet spot. It's made in 188604 with local equipment, has to make compromises because it's a transforming vehicle able to fit many roles that dedicated frames or fighters don't, and is meant to be improved upon with later models.
This kind of takes the notion of starship speed guidelines and it breaks them over its knee. It's baseline speed in frame mode is .41, whereas the one listed in fighter is .45, which is the absolute fastest a ship can be under the guidelines...if it makes significant compromises, like literally being unarmored and giving it a .4x structural point multiplier that should give it an SP of 10 ADR, about on par with a Mindy.. Even a speed of 4.1 should give it a max SP of 15. In limiter mode it breaks these absolute limits by a whopping .05 C at .50.
Even setting aside guidelines like that, let's compare this to existing fighters of the sectors most advanced military, Yamatai.
It's current gen fighters, The Ke-V6-2A
Hayabusa 2 and the upgraded
Ke-V8-2X Kawarime which have a speed of .4c, 16 and 18 hull respectively, 20 SP and a threshold of 4. Yamatai also has the
Ke-V9 Nodachi an assault fighter with comparable hull and shields has a top speed of .375. It also uses the exact same propulsion as it says the booster module does, ironically enough.
To use a non-yamatai example, let's take the
Na-F/A-7X Goliath which was made in YE-38 by Neplesia, so we can probably assume it's near the cutting edge. It also has a hull of 25 ADR, but only has a 15 SP in shield making it more comparable to the Hayabusa and Kawarime 2 in durability. It's baseline top speed is a mere, 365, but has a mechanism similar to the limiter which gives it a whopping...385 c.
It would outspeed almost every fighter in the setting in mecha mode, and handily spank them in fighter mode, especially with the limiter while beating (and in one or two rare cases simply matching) them in terms of durability or firepower. While being a variable fighter.
I'm also kind of leery about the idea of letting the limiter let it break the starship speed guidelines. Yeah I just linked the the Goliath, but it's relatively low shielding means it's more like 20 SP putting it's max speed at .4. Also, given the only battle I've taken part I don't even think broke a minute, their doesn't seem to be any limitation on turning it on or off, or any penalty once the five minutes are up I don't see it being a 'real' limitation. Their's not many scenario's in combat where I can think this wouldn't be on.