From the abstract of the paper linked in the article: No change for the UK variant, but lower efficacy for the South African variant (if my understanding of the abstract is correct):

No significant impact on neutralization against the B.1.1.7 variant was detected in either case, however reduced neutralization was measured against the mutations present in B.1.351.

Paper : https://www.biorxiv.org/content/10.1101/2021.01.25.427948v1