Naturalized Argentine citizen can lose (not loose

their citizenship in one of two ways:
(1) File a request before a federal judge to renouce their Arg citizenship.
(2) Be found guilty by a federal court of providing incorrect information as part of their citizenship application.
You can spend 100 years outside of ARG and nothing will happen.
The 2 years period is for permanent residence and that's not very tightly enforced but could obviously happen.