Earlier quoted context omitted.
> "They" implies multiple No. It doesn't. The Oxford English Dictionary traces singular they back to 1375, where it appears in the medieval romance William and the Werewolf The New Oxford Dictionary of English (1998) not only accepts singular they, they also use the form in their definitions. And the New Oxford American Dictionary (Third Edition, 2010), calls singular they ‘generally accepted’ with indefinites, and ‘…
Well, one can cherry-pick one's authority on grammar, but any online translator will translate "They walk" to "Ils marchent". One also wouldn't write "they is", so, yes, it's a plural. At least, a sentence should be consistent and not intersperse "they" with "him".
You have the air of that fundamentalist branch that forked off in central north america to worship a prescriptive Elements of (Our) Style by Stunk & Whine.