I posted more background about this fake journal here.
As for me, I think I'll take a pass on this invitation (excerpts below, with bolding and sarcasm added):
Initiated with an aim to promote the development of scientific community, specialists and professionals in different research fields can get the latest research results from International Journal of Philosophy. In light of the advance, novelty, and possible wide application of your innovation, we invite you with sincerity to contribute other unpublished papers that have similar topics to the journal. Your further research on this article is also welcomed.
On behalf of the Editorial Board of the journal, we feel very honored to invite you to join our team as the editorial board member/reviewer of International Journal of Philosophy. Considering your academic background and expertise in this field, the Board believe that you may be the most suitable person for this position. (Who me? *blush*) It is believed that your position as the editorial board member or reviewer will promote international academic collaborations.