I doubt it. The
Civil Partnerships, Marriages and Deaths (Registration etc) Act 2019 does not make foreign opposite-sex civil partnerships equivalent to British opposite-sex civil partnerships, which the original Civil Partnerhsip Act 2004 had done for same-sex couples.
Then again, the Act has not yet made civil partnerships available to opposite-sex couples. What the Act does is that it gives the Secretary of State powers to make regulations on opposite-sex civil partnerships. Such regulations should be made between 26th May 2019 (two months after the Royal Assent on the Act;
Section 6(3) of the Act) and 31st December 2019 (
Section 2(2) of the Act). So, be patient until the relevant regulations have been made. Once they have been made, we will be in a position to answer your question.
I am not a lawyer or immigration advisor. My statements/comments do not constitute legal advice. E&OE. Please do not PM me for advice.