It looks like the Ezekiel/Jeremiah/Isaiah "class" is now referring to the Governing Body alone.
"During the time leading up to the destruction of Jerusalem, Ezekiel served as a watchman along with Jeremiah, just as Isaiah had previously done. Today, Jehovah is using a small group of his anointed servants to feed his people and warn others before the outbreak of the great tribulation. In turn, all of Christ’s domestics have a share in sounding the warning."