This is probably going to get a lot of press, unfortunately. PR
On the page there are a couple of links to the full study which can be downloaded.
Lots of shortcomings to the whole study.
Ongoing and incident L-T4 treatment in patients with HF was associated with an increased risk of all-cause mortality, cardiovascular death, and MACE. Increased risk of MI was observed for ongoing treatment, and reduced risk was observed for incident treatment.