Were this true then FD would have said VR is still supported, but might be sickness inducing when walking around on foot.We've been told that VR is not being removed from existing game content - so neither are VR players losing their display method.
That VR is not going to be included in Odyssey at launch suggests to me that one or more non-trivial implementation issues exist regarding non-seated gameplay.
HDMI adapters for phones exist.
They could very easily and clearly answer the VR questions, which they have only partially done, because they haven't said if VR will only work on the Horizons client, or if VR will still work in Odyssey just as it does today, but isn't recommended for walking about due to they haven't yet got a good solution for that to prevent headaches and puke.