I agree find another shop, but... your lower back will have to be stretched and put into road bike shape, so you might have a little pain or issues initially if you have not ever ridden one in a while. But after a few rides you should be ok.
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Brian | 2023 Trek Domane SLR 7 AXS | 2023 Trek CheckPoint SL 7 AXS | 2016 Trek Emonda ALR | 2022 Trek FX Sport 5
you should learn to embrace change, and mock it's failings every step of the way.