I have this doorbell and I have it feeding into my Synology Nas Surveillance Station. I'm using the same solution that was described by @richard-brown in the post you quoted. It works well.
Could you elaborate? I'm running the full version of Blue Iris and just ordered a Reolink doorbell. I'd like to send a notification to HE when the doorbell is rung. I know how to send HTTP commands from BI to HE but don't know how the use BI to detect the button press. TIA for any info.