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This is the 400G Rx Optical Engine on EVB from Oppengheimer Conference August 10, 2021. You can see the date on it (2021-04-12). This product was part of the last new release. https://money.tmx.com/en/quote/PTK/news/7279901685045369/POET_Technologies_Announces_Production_Release_of_Optical_Engines_for_100G_200G_and_400G_for_Telecom_and_Data_Center_Market
This is the 1.6-terabit Receive Optical Engine, 4x400G FR4 RX chip, which has 4 sets of 400G in one chip. The tweet is from Sep 27, 2022, but you can see on the picture that the chip is dated (2022-07-14).
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https://twitter.com/POETtech/status/1574439440180989952/photo/1
I agree with most of you, great things should be coming soon. Wish my head could stop watching the daily movement of the share price and give my heart a break.