No, incorrect
They were fixed. I was in the USAF shuttle program office.
The water suppressant system "issue" was just an urban myth and it had
nothing to do the actual system. It was an unsubstantiated theory
about the sound reflecting of the nearby mountains. Delta IV launches
disproved it

As for the "the equipment would not have withstood the extra weight of
a fully loaded shuttle after the 1986-1988 SRB redesign" is a bunch of
BS.
The redesign did not add a significant amount to the total stack
weight. Just the very thought of this is absurd. The total stack
is 6M lbs and the mods to the SRBs were on the order of a few 10k lbs,
which is less than 1%. The pad was not on the edge of its capability
wrt the total stack weight