That’s a Salvi Arianna concert grand, and yes, she does appear to be rather tall.
I watched part of some of the other videos. Her delivery sounds like she’s speaking “off the cuff” rather than from a script. Among other things, she said Salvi and Lyon & Healy have been building harps for 150 years. That’s incorrect. Lyon & Healy built their first harp in 1889 and Salvi in 1954.
Many of us occasionally have posted information we thought was accurate and have recanted when we found we were wrong. It seems careless to make “instructional videos” with misinformation which can be so easily checked. Just my opinion, which is not worth much.