Not to argue the issue regarding inadequacy, but the fact that the tiger got out has no bearing on whether the enclosure was substandard or not. The standards are defined independent of the actual behavior of the cat - with the intention that following the standards would confine any enclosed cat.
I would agree that the animal’s escape is indicative of an inadequate enclosure, but do not know whether or not the enclosure itself was within the guidelines for such pens.
I'm not sure I follow you. The guidelines are there for the purpose of designing safe pens that the animal cannot escape from. You can conceivably construct a safe pen with lower walls than the recommended height, which is why it's a guideline rather than a rule, but if the animal can escape then it's not standard. The SF zoo had built a moat, which probably would have made the pen okay, if it were filled, but it was not. Moats aren't built to be dry holes.