Thanks for letting us know about the issue you're experiencing with the channel.
Did you restart your Roku device before re-installing the channel? That step is crucial when performing troubleshooting. If you haven't tried the suggested order (remove > restart > re-install), we would recommend giving it a shot once again.
If you are still unable to play videos from one channel, videos from other channels play fine, contact the channel provider's customer support team to report the issue and get help. Channels on Roku are maintained by the channel developer themselves. There's likely an issue within that specific channel that needs to be addressed with an update from the channel developer.
You can reach them here: Netflix Help Center
We appreciate your understanding.