They have proportional representation according to Wikipedia (emphasis mine):
The 250 members of the National Assembly are elected by closed-list proportional representation from a single nationwide constituency. Eligible voters vote for electoral lists, on which the candidates of the accepted lists are present. A maximum of 250 candidates could be present on a single electoral list.
They have proportional representation according to Wikipedia (emphasis mine):
So it’s not really relevant to fptp systems. Where third parties are in most every case spoilers and fundamentally non viable.