Earlier quoted context omitted.
> or did I just read too fast? I must have read too fast as well. The author would have done well to include several examples, and they doesn't include any examples. Almost makes me feel like they is pranking me, to be frank.
> The author would have done well to include several examples, and they doesn't include any examples. Almost makes me feel like they is pranking me, to be frank. "Singular they" still normally pairs with plural forms of other words, not singular forms: "I talked with a person today. They were interested in grammar.". (Rather than "They was interested", which sounds completely wrong.)
You wouldst not match the verb form associated with "thou" when using the singular "you". When anyone does, they sounds wrong to the ear of a native speaker.
(The above is intentionally wrong for illustrative purposes.)