Will it be ICPC 2020 or 2021

According to rules at The ICPC International Collegiate Programming Contest, it seems you will be eligible as it is ICPC 2020. Relevant quotes from the rules:

Note: The 2021 World Finals will be held after the 2020 World Finals and announced as soon as the world situation allows.

Note: If the 2020 regional year is delayed, we still determine the eligibility at the point as if the year was not delayed (normally October 1 2020).