Yeah, that's one possibility. Another I initially thought is that it's a Muslim trying to gather info. But then, you might ask, how does he know about Sikh textual sources. Well, you'd be surprised at their resourcefulness. A final possibility is he's a weak Sikh who was asked a question by a non-Sikh and now he's suddenly feverishly wondering where it's "written" that you can't marry a young child. To the latter, I would say, you're looking in the wrong spot. Gurbani isn't a 1428 page rulebook, like Leviticus or the Vedas: ਸਿਮ੍ਰਿਤਿ ਸਾਸਤ੍ਰ ਪੁੰਨ ਪਾਪ ਬੀਚਾਰਦੇ ਤਤੈ ਸਾਰ ਨ ਜਾਣੀ ॥ ਤਤੈ ਸਾਰ ਨ ਜਾਣੀ ਗੁਰੂ ਬਾਝਹੁ ਤਤੈ ਸਾਰ ਨ ਜਾਣੀ ॥ The Simritis and Shastras discriminate between charity and sin, but know not the essence of the Real Thing. Without the Guru, they know not the essence of the Reality, know not the essence of the Reality. Anand Sahib.

back then was waaaay different. ppl didn’t attend higher education or have much to do after the age of like… 13, lol. you’d have 13 year olds boys and girls that know how to do kethi, cook entire meals, etc    nowadays even 22 year olds are extremely immature and can be sheltered. the average person doesn’t know how to do anything except their 9-5 which they are probably half arsing as well.    

Yeah Dhadi and Kaweshria are known for joking around now and then.