I think I have to agree with the journalist on this one.
These guys and girls who try to inject humour into their p.a. just don't sound too professional. A certain low cost airline obviously encourage their crews to attempt humour with p.a.'s such as "In the event that you're caught smoking on the aircraft then you will be marched to the back and asked to leave". A fair percentage of passengers hate flying and for many it's a once-a-year thing so knowing that the crew is both serious about their work and acting in a professional manner installs confidence. There is a time and a place for humour but I don't think it is appropriate to be used by someone who is providing a professional service and is ultimately responsible for another's life. You would be a bit concerned if the surgeon said "Well Mr Smith it's such a lovely day outside that I think we'll do the operation in the gardens"!
Your feedback I'm sure will follow.