I read these reports on the giant, imaged exoplanet using astrometry too.
New exoplanet discovered,
https://www.sciencedaily.com/releases/2023/04/230413154452.htm
My note. Apparently there is some disc around the parent star. "Its host star is surrounded by icy debris left over from planet formation, similar to our solar system's Kuiper belt, the ring of icy objects observed around the Sun." "The star is surrounded by a luminous cold, Kuiper belt-like debris disk on > 150 au scales. See Supplemental
Material for more details."
Ref - Direct imaging and astrometric detection of a gas giant planet orbiting an accelerating star,
https://www.science.org/doi/10.1126/science.abo6192, 13-April-2023.
Direct Imaging and Astrometric Discovery of a Superjovian Planet Orbiting an Accelerating Star,
https://arxiv.org/abs/2212.00034
My note. The exoplanet is superjovian and is about 5.1169E+03 earth masses or 5116.9 earth masses. The host star is about 1.85 solar masses. Applying the MMSN to 1.85 solar mass star, the postulated protoplanetary disc mass (total) ~ 6.159751E+03 earth masses. We could speculate the original protoplanetary disc mass was much larger than this to explain the origin of 16.1 Mjup exoplanet at about 17 au.