Yes, many other KJV-only advocates do in effect admit that there are archaic words in the KJV.
They do vary in their claims concerning how many such words are found in the KJV. Some have claimed only as few as 12 to 24. KJV-only advocate Robert Sargent claimed: "No one denies the AV does contain some archaic words, albeit no more than a dozen" (Is the NKJB the Word of God, p. 4). Pastor Bruce Cummons claimed that there are "perhaps 12 or 14 at the most" archaic words in the KJV (Critique of the NKJV). Jack Moorman wrote that no more than twenty words in the KJV would cause a problem as "Old English" (Modern Bibles--the Dark Secret, p. 2). Lloyd Streeter maintained that "there are only about two dozen of these" 'difficult' words" (75 Problems, p. 279).
In one book, Peter Ruckman asserted that “there are about eighty words” in the KJV that are archaic (Scholarship Only, p. 144). In a footnote, Ruckman indicated that there are "about 100" archaic words in the KJV (Christian's Handbook of Manuscript Evidence, p. 180). In one booklet, Ruckman suggested that “the entire list” of archaic words in the KJV “would not come to even one hundred words” (Alexandrian, Part One, p. 21). Ruckman again wrote: “There are not one hundred words that are ‘archaic’” (Alexandrian, Part Six, p. 26). While Ruckman provides evidence to refute the KJV-only myth that there are only twelve to twenty-four archaic words in the KJV, other KJV-only advocates give information that conflicts with Ruckman’s statements.
It seems that KJV-only advocates cannot agree on how many archaic words are found in the KJV. KJV-only author David Cloud maintained that “there are only about two hundred words in the KJV that have become so antiquated that they have changed meanings or have dropped entirely out of common usage, so that you really need a dictionary to understand them” (Bible Version Question/Answer Database, p. 162). KJV-only author Floyd Jones wrote that “there are only several hundred obsolete or archaic words remaining within the 1611” (Which Version, p. 52). A booklet by KJV-only author David Daniels has “over 500 archaic words defined” (KJB Companion). In one of his books, D. A. Waite acknowledged that there are 618 words in the KJV whose meaning has changed since 1611 (Defending the KJB, p. 1).