For amusement (mine at least, if not magic's
), and to ram home the point about "their/they" having a longstanding and standard meaning of "an indefinite person without specifying gender"...
Here's
part of the OED reference
https://www.oed.com/view/Entry/200700#eid18519864 with
my emphasis (full formatting and characterset hasn't survived, of course; see the reference if in doubt)
they, pron., adj., adv., and n.
...
2. In anaphoric reference to a
singular noun or pronoun. Use of they to refer to a singular antecedent has sometimes been considered erroneous.
a. <snipped>
b. With an antecedent referring to an individual generically or indefinitely (e.g. someone, a person, the student), used
esp. so as to make a general reference to such an individual without specifying gender. Cf. he pron. 2b.In the 21st century, other th– pronouns (and the possessive adjective their) are sometimes used to refer to a named individual, so as to avoid revealing or making an assumption about that person's gender; cf. sense A. 2c, and quots. 2008 at their adj. 2b, 2009 at them pron. 4b, 2009 at themself pron. 2b.
a1450 in Neuphilol. Mitteilungen (1948) 49 154 (MED) If þou sall lofe, Þe person fyrste, I rede, þou proue Whether þat thay be fals or lele.
1526 W. Bonde Pylgrimage of Perfection iii. sig. IIIiiiiv If..a psalme scape any person, or a lesson, or els yt they omyt one verse or twayne.
1653 Mercurius Pragmaticus No. 8. 61 If any one of them so elected members die, the part which they serve for, have liberty to chuse and present another.
1759 Ld. Chesterfield Let. 27 Apr. (1932) (modernized text) V. 2350 If a person is born of a..gloomy temper..they cannot help it.
1818 H. B. Fearon Sketches Amer. 80 Servants, let me here observe, are called ‘helps’. If you call a servant by that name they leave you without notice.
1877 J. Ruskin Fors Clavigera VII. lxxx. 234 I am never angry with anybody unless they deserve it.
1940 Educational Forum May 423/1 True education is based upon the needs of the pupil... The needs of the pupil are expressed in the activities in which they are engaged.
1968 Listener 3 Oct. 440/3 When somebody becomes prime minister they're immediately put on a pedestal.
2019 @_ShristiUprety 26 Aug. in twitter.com (accessed 28 Aug.) My personal rule is to never trust anyone who says that they had a good time in high school.