[spiznnx]

you are (mostly) agreeing (except for precise definitions of metallic and ceramic). Their comment is unclear, but it means

"In almost all applications of superconductors, they don't use high-temperature ones. [...] The ones [the superconductors] that see use in the LHC, for instance, aren't [high temperature superconductors]."

It just has a sentence in the middle of it that confuses you into thinking their antecedents are "the HTSCs" and "ceramic" instead of "the SCs" and "HTSCs".