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Doesn't sound like a keyboard to me, but whatever the instrument, Jazz is a style of music whether played on a trumpet or not.
I only heard P B Stewart perform live on one occasion, and that time he was on harmonica with only one accoustic guitar backing. I recall he played a very bluesy version of Amazing Grace, and the theme to Last of the Summer Wine. No trumpet in sight at that venue, but no keyboard either.
The main point of my post was that it's good to see that people are still making Jazz music. I'm not really bothered how they make it. It's just cool that it's still alive.