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Yes, but you need to have spent CU and RU before activating Numpad 3: Unlimited CU/RU.

As the read-me file state:

you must FIRST buy something using CU. THEN, you can
toggle this option on. It may take several seconds for this option to work.
The NEXT item you buy, your CU or RU will increase if you are spending some.

I found that some missions start without CU or RU and thus cannot spend any making the trainer's code inoperative. That said, it didn't stop me from wining those missions 🙂

I tried Skirmish mode with AI. (3vs3)
And when i activated that option, 1 enemy carrier and 1 friendly carrier blew up. so you are correct. altho i haven't had this issue in the campaign.

Video of the bug in action during Skirmish: youtu.be/vcx27WgqMrs

Please use the update notification system to report a game patch, update or to report that the trainer may not be working with the latest version of the game. If 3 or more reports have been filed, consider BOOSTING the priority of this title for a faster turnaround on the updated trainer.

Just went back to re-visit this game and saw the trainer got updated.

Sadly the skirmish bug is still present same as in the video above, I know there's probably nothing to be done about an older game like this, just a heads up for anyone else trying to use the trainer in skirmish.

So i found that if you wait about 5 to 10 minutes to allow your enemies in skirmish to gain resources the carriers do not blow up when you do unlimited CU/RUs