We call it 'bot promotion'. It happens when there is a vacant spot in a higher league that can't be filled by someone who won a lower league.
Each D2 has 2 direct demotions plus 3 demotions following relegation series. So there is a total of 5x4=20 demotions. D3 has 16 champions, that means that at least 4 D3 teams will be bot promoted. It may be more than 4 if there are teams that went bot during the season in either D1 or D2.
Bot promotion is based on conference standing first (so all first placed are ahead of second placed, irrespective of record), then record and then PD. As you are 1st, 22-0, 1360 PD, it seems quite likely you will promote. However, to be absolutely sure, you need to check if there are bots in any D2 and how many D3 conference winners have an equal record and better PD than you.
From a quick look I think you have the 6th best record. So you need at least 2 of the top 5 to promote by winning the league: it looks quite likely.
Last edited by Lemonshine at 9/3/2020 7:29:28 PM