see https://www.inaturalist.org/flags/517864
&
https://www.sciencedirect.com/science/article/abs/pii/S0254629918323135?via%3Dihub

However, in the paper they list it as an uncertain species, not as a synonym for T. fragile ....

5.3. Notes on uncertain taxa
5.3.1. Thesium confusum J.C.Manning & F.Forest mentioned in Bothalia
43:2 (2013)
Thesidium fragile Sond. in Flora: 364 (1857a), non Thesium fragile L.f.
(1782).
We were not been able to locate any specimens stored under the
name ‘T. confusum’. Hence, we have excluded T. confusum from our treatment. However, von Staden (2015) is uncertain as to its provenance, assessed its conservation status as data deficient and conspecific with T. fragile.

So I am committing it as all records currently on iNat as this species are probably T. fragile as summarized in this paper.