I wouldn't believe a word those guides say, as some of them make it up as they go along.
The falcon has been seen in the roof during games. If you kept a falcon, would you bring it in & allow it to fly freely during a match?
Yeah, seen it several times, usually under the WS roof. Only reason it came up during the tour is because I noticed it there then and asked. Don't know a lot about falconry but can't imagine it would be bothered by what's going on on the pitch.