You need to dispose of it only once on the rental statement.
When you moved out of your condo and started renting it, you had a deemed disposition of the property from personal to rental use at FMV at that time (property was sold and immediately acquired for rental purpose). If it was 4 years ago there was no reporting requirement yet. You had to complete T2091 at that time and keep it for your records.
This year you are reporting sale of your deemed acquisition from 4 years ago and property sold was not a principal residence.
https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/tax-re...
