Say the word "though" in your head. Then add a "t" to it. Would you really argue that "though" and "thought" are pronounced the same simply because they're the same spelling save for a final "t"?
The easiest "rule" is that the creator can decide how to pronounce and spell it lol. Taking English rules that don't even apply 100% of the time to its own words and trying to hold made-up words to the same standards just sounds silly to me haha
There are so many examples in this thread alone as to why this rule doesn't work.
SCUBA: the U is for "underwater" and the A is for "apparatus". We don't pronounce it "SC-uh-B-ahhh".
JPEG: The P is for "photographic". We don't pronounce it "JayFeg".
LASER: The E is for "emission". We don't pronounce it "Lay-See-R".
RADAR: The second A is for "And" (lol). We don't pronounce it "Ray-Day-R".
The easiest "rule" is just the guy who made it up can dictate how they want it spelled and to pronounce. The word is made up anyway, and isn't subject to rules that actual English words have been subjected to for however long the language evolved.