Is it confirmed that private students from cbse or nios are now eligible to sit for neet 2020? Has it been issued by the council?

Hello,
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Yes, according to recent updates NIOS students are now eligible  to give NEET.

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As NIOS Is a recognised qualification.Candidates who have passed as private candidate are now eligible  to give National Eligibility Cum Entrance Test  held for admission to MBBS as well as BDS course in the country

They can pursue MBBS in India as well as abroad.
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Hope this was helpful for you.
Thank you

Dear Tenzing, CBSE has issued a notice in 2018 that all Candidates who have studied in NIOS or Private Schools are now eligible for NEET 2018. This statement has been issued after the directive of The High Court. So since 2018, NIOS candidates and Private Candidates have been appearing for NEET. You may find this article helpful:
https://medicine.careers360.com/articles/neet-2018-what-nios-students-and-private-candidates-should-know