No, the Ocean cast did not dub episodes 54-107, and that's always been a particular sore spot for me as far as the history of the dub goes.
For starters, for those who've seen episode 108, just listen to the actors themselves. It's clear that some of them are a little "rusty" at playing the characters, particularly Drummond and McNeil. They don't sound quite like they did when they had previously left off at episode 53 a few years earlier. Later on in the Android Saga, they sound more "normal" again, for lack of a better term. One would have to assume that they wouldn't have ever missed a beat if they'd dubbed the rest of the Freeza Saga. Lower quality voice direction of the Westwood dub aside, it's clear when you watch those early episodes that the actors needed some time to re-accustom themselves to the characters.
When the Ocean cast returned to record in the summer/fall of 2000, they were told that they were brought back because international audiences disliked the FUNimation in-house cast, and wanted the international cast back. Don Brown said as much in a telephone interview conducted with one of the UKDB guys in 2002. Whether this is true or not, one would have to assume that if an Ocean dub of 54-107 was available, those networks that supposedly received complaints would've sought it out (especially if FUNi was charging more for their dub). It stands to reason that a hypothetical Ocean 54-107 would've aired somewhere, or at least we would've been told of its existence at some point over the years.
If you want more solid proof of the episodes having been skipped entirely, the matter was specifically addressed in this 2016 interview
with Brian Drummond where he is asked about those episodes and the reason why the Ocean cast arbitrarily returned at episode 108.
Regarding those CRTC approval listings, those are just bizarre, and nonsensical. Episodes 220-276 aired in Canada between September 2002 and March 2003, so it's completely baffling that there wouldn't have been an entry until 2005. By that time, the episodes were still being shown in reruns on YTV, but YTV was already winding down their airings of the Dragonball franchise as a whole and stopped showing any of the three series soon after.