It was never announced, someone just added it in the wiki.
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Although still heavy rail and not metro, Simvliet Bergpark station has three tracks in the new version. And at (possible future station) Simvliet Zoo the freight line is almost next to the metro as well.
It was an attempt to add a third track to Simvliet for the HSM to gain some speed, but it didn't work out (you couldn't really go as fast as an HSM could) so it was abandoned. The upcoming Simvliet Lightrail is probably a better place to gain some speed with the HSM anyway.