This pyramid must be centuries and thousands, even, of years old

Question

Here's a subtitle of the TV drama "Sesame Street: Bert and Ernie in a Pyramid".

https://www.youtube.com/watch?v=8yiqGtZXCmQ

0:22

Burt: Yeah, look at the knowledge here. This pyramid must be centuries and thousands, even, of years old. This is great.

Perhaps Burt wants to say "This pyramid must almost be centuries and thousands, even, of years old." But it seems to me that he says "is" instead of "must". What exactly does he say?

Answer 1

"Sesame Street: Bert and Ernie in a Pyramid".

Video Clip: https://www.youtube.com/watch?v=8yiqGtZXCmQ (0:22)

I hear Bert say the following:

• "This pyramid is...ahh must be centuries...and thousands even of years old, this is great!"

The "ahh" is typically written as hmm or um and is considered to be a filler word.

To illustrate meaning, it could be written as follows:

This pyramid is... hmm... This pyramid must be centuries (and thousands even!) of years old; this is great!