Denselight is a bit of a touchy subject these days.
Here is a link to their presentation from this past Tuesday.
At the 8:57 mark they reference the optical interposer. The following slide they mention the optical interposer for direct flip chip but this time they didn't reference the Acacia patent from January 2020 alongside it. ( the picture of that patent can be found on our picture gallery for reference. )
https://youtu.be/nY5AOXrpUrE