I'm guessing Steven A is quoting someone that reads this board! There is your source.
That said, this is the time of year where teams start talking trades to prep for next season. I'm sure Snead is actively having conversations about trade interest,
If someone asks him about Goff, I'm guessing this year he is listening to offers whereas 2 years ago that was an untouchable conversation....
Is he actively putting out there that Goff is on the table to any teams with interest? Probably not. That will just lower the value if it looks like you are trying to push a guy out. I'm pretty sure Snead said as much in an interview.
From what I've heard, the Senior bowl is a great place to discuss trades because you can do it in person without all the documentation and extra eyes/ears.