Hello Alex. I just left a comment for @nohelimedic explaining that no one "silenced" his participation.
Rather it was likely an error or oversight that took place perhaps resulting from either inadvertently missing it among hundreds and hundreds of entries, or for some other platform related technical issues.
I have been telling everyone who has experienced this the following:
If this happens, which it does from time-to-time with so many entries, - just post a comment under the "See Who Played" post, and ask @luzcypher to please review it for you. He has already fixed two or three such entries this week that I am aware of.
Thank you for your question and concern, my friend. :-)