Sorry to hear about your situation.
Correct me if I'm wrong, you say you started counting your work experience from Sep 2019 (let's not worry about a few days and just round to months). Then Sep 2020 you get your ITA and apply right away, which technically is 1 calendar year, yes, but probably did not reach the threshold of 1 work year that IRCC expects from candidates. I think you applied too early and that brought their attention.
Correct me if I'm wrong, you say you started counting your work experience from Sep 2019 (let's not worry about a few days and just round to months). Then Sep 2020 you get your ITA and apply right away, which technically is 1 calendar year, yes, but probably did not reach the threshold of 1 work year that IRCC expects from candidates. I think you applied too early and that brought their attention.