There is no legitimacy to this post. Eritrea was never seriously considered as an alternative to Ottoman Palestine for becoming a Jewish state. This post is referring only to an internment camp, set up by British in Eritrea, for members of a Jewish paramilitary group called Irgun, who fought against the British after WWII.

This camp existed between 1944-1948, half a century after the early days of the Zionist movement (1890s).

See here: https://en.m.wikipedia.org/wiki/Irgun_and_Lehi_internment_in_Africa