He is mentioned twice in this Wikipedia article https://es.wikipedia.org/wiki/Establecimientos_argentinos_de_la_Patagonia_oriental (East Patagonia Argentine Settlements)
1) En el año 1815 el explorador galés Henry Libanus Jones que se había asociado con la empresa bonaerense de Carleton Allsopp, comandando el bergantín Antílope, junto al Mercedes del capitán Nelson y ambos bajo Bandera de la Argentina, refundó el establecimiento de San José como centro de caza de lobos marinos en la península de Valdés y en las regiones contiguas.8 En 1818 el establecimiento seguía funcionando pero Jones comandaba el bergantín Director y figuraba asociado a Miguel de Irigoyen y a Juan Pedro Aguirre, hasta que en 1820 dicho comercio peletero comenzó a mermar.8
Translation: In 1815, Welsh explorer Henry Libanus Jones was in association with the Buenos Aires bussiness company from Carleton Allsop, commanded the brigantine Antilope under Argentine flag. Along the Mercedes, commanded by a Captain Nelson, he refounded the San José settlement, aiming to it to become a center of sea lions hunt in and around Valdes peninsula. In 1818 the establishment continued to operate but Jones was in command of another ship, the Director brigantine, in association with Miguel de Irigoyen and Juan Pedro Aguirre. In 1820 the fur trade begun to dwindle.
2) En 1854, el ganadero y explorador galo-argentino Henry Libanus Jones había construido a orillas del río Chubut el poblado y guardia llamado «Fuerte Paz», como puesto de avanzada para expediciones de caza y recogida de ganado cimarrón, pero como fracasó económicamente la empresa, sería abandonado en 1856.15
Translation: in 1853, welsh-argentine rancher and explorer Henry Libanus Jones had build along Chubut river a settlement-fort called "Fuerte Paz", as an outpost for hunting expeditions and wild cattle pickup. The enterprise failed economically and was abandoned in 1856.
There's a longer article https://es.wikipedia.org/wiki/Colonizaci%C3%B3n_galesa_en_Argentina in Spanish about Welsh colonization in Patagonia that mentions him as a pioneer but his name is omitted in the English translation.
I hope this helps!
PS: I know Wikipedia is not the most reliable source, but maybe you could get leads to more solid sources.