I'd be very careful claiming that LTE provides an "enormous boost to battery life" based on a benchmark that loads web pages at a fixed interval, with fixed brightness, and with minimal caching.
In this particular benchmark, it is very clear that LTE is the winner across the board. In 'real world usage', I have to disagree. I'm sure anyone with an LTE phone will tell you that disabling the LTE radio absolutely gives a boost in day-to-day battery life.