No, because the Myson flexi's are definitely continuously rated for circa 80 deg C water and every other commonly (i.e. cheap and from a shed or plumbers merchant) available flexi that could possibly be adapted for this installation has a published limit of around 60 deg C, that's not to say they won't work, just that they might not and the consequences of failure are pretty messy.
If the compression fitting has been overtightened and damaged the pipe then you might have to cut the pipe and fit the new fitting slightly closer to the heater body. To make the job easy then get a 15mm pipe slice such as this:
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