This is not correct info.
Letter is mentioning for the passport which has more than 12 months expiry.
In the letter they do ask for
Supplementary Information – Your Travels (IMM5562): The principal applicant and all family
members included in the application who are 18 years of age or older must complete this form
It makes sense if you are filling that travel form that you would provide passports covering the 10 year period to show proof of travel history in that period.
so the passport thing is BOTH the request for current passport with 12 months validity
AND
All previous passports that cover the 10 year period for the purpose of proof of travels in the supplementary travel information form.
I agree with my lawyer providing that information upfront. It is very time consuming. But I think it will make my case officer's work easier when processing.