The concern your board fabricator most likely has, might be due to
one side of the board metal (conductive pattern) being coated with
soldermask while the other side is exposed. This condition can
result in a bow, if the board has a HASL finish. The HASL process
thermally shocks the panel and coating only one side can cause
that panel to bow. The simple answer would be to change the
surface finish to something like white tin. This finish does not
thermally shock the board and shouldn't cost more.
thanks,

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