I'm sorry but. . . what mission are you asking about?
I'm assuming Khitomer Accord?
Sounds like he's referring to Donatra's special in KASE. I'm suspecting that Donatra's massive speed boost upon cloaking comes from triggering some sort of special variant of evasive maneuvers, just long enough to gain distance, whip around to face whoever she hates the most, and then decloak.
Meh. Run APO and carry engine batteries and you should have no problem with this (the APO specifically for when your own evasive is on cd).
Ya know that before she fires off her boom tube, the cone is shown, right? Just hit evasive and scuttle out of it. Heck, it lasts long enough for you to sit and have tea with your team while you wait for her to fire. Use an engine battery, hit ApO, evasive, all power to engines, something. Easy peasy.
As for her cloaking, she needs something other than her giggle cannon, no? What, expecting her to lay there and die? Not that I would complain, just be a pretty boring match if that happened. Not seeing the problem there. It is considered a boss fight.
How is it misleading? It has a certain range that is clearly marked. Just move out of that range. Your best bet is to move toward and slightly to the left or right, as the cone narrows to her firing point.