question about bathroom wall Lining

I was told recently by a "tradesman" that I should not use "blue boards" in a bathroom area.
I should use the correct "wet area lining systems" avalible....

Apparrently "blue boards" are rated external use...and are "Quote...Immune to permanet water damage fire resistant and termite resistant...

but if i was applying the same waterproofing solution to the outer surface of the blue board to tile over won't i still get the same result.....

can someone please confirm or explain any other circumstances....

Thank You.


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