that’s what I remembered seeing - that is not a folding extension ladder. The reports then came out he’d bought a 5’ ladder at HD right before. An extension ladder would be 5’ when folded ... but THAT is NOT an extension ladder.
That step ladder is the kind of ladder normally used indoors - maybe to change a light bulb or work on the sprinkler system in an office or small shop. Judging from the length of it, it would be perfect for use inside the building on which it is leaning.
Wagner standard rung-to-rung is 12 inches.
Count the rungs, like Catturd said.