Is a Keurig K-Cafe "shot" really an espresso shot? I've been trying a Keurig K-Cafe, which includes a "Shot" feature that slowly produces what looks like a shot of espresso from a regular ("coffee") K-cup.  What is the machine doing to produce that, and is the resulting liquid comparable to "real" espresso?

(I'm not enough of a connoisseur to tell the difference between straight espresso and these K-Cafe Shots.  I understand that "real" espresso is made by passing water through the grounds under high pressure.  I can't see that the K-Cafe has a mechanism to accomplish that.)
No, sadly it's absolutely not an espresso shot. 

To get a real espresso shot the ideal settings are to have freshly ground coffee into a portefilter basket leveled and compressed using about 15kgf of force. The amount of coffee should be around 14g-18g (for a double shot) as an input, the output should be like 28-36g (we are talking about a tradtional espresso with a 1/2 ratio). All of this should be done under around 9 bar pressure. A Keurig simply doesn't respect any of theses parameters.