Yes, but what your fact check article does not say is that they use a synthetic;y produced squalene that is not taken from sharks, and they give it a different name, but it it works the same
The Janssen COVID-19 Vaccine includes the following ingredients: recombinant, replication-incompetent adenovirus type 26 expressing the SARS-CoV-2 spike protein, citric acid monohydrate, trisodium citrate dihydrate, ethanol, 2-hydroxypropyl-β-cyclodextrin (HBCD), polysorbate-80, sodium chloride.
HBCD is HPβCD. Is that what you are calling synthetic squalene?