There are too many terms that people use to mean different things. In some journals OBLA is the same as Lactate Threshold, Anaerobic Threshold, Aerobic Threshold, Lactate Turnpoint, or any other term used. There's a lot of confusion.
Some say OBLA is the first rise in lactate from resting levels, others say it's the first significant rise (i.e. 1.5mmol over resting level).
Tempo is even more confusing because it doesn't have anything to do with lactate. Some use tempo to equal lactate threshold pace, others marathon pace, others a critical velocity pace.
So in conclusion it depends on the coach/scientist.
And for kicks, I use OBLA as Lactate Threshold (point where lactate production exceeds lactate elimination). To find a true LT, the test would have to be like a 30min run where there is no significant rise in lactate from 10min to 30min. However this is time consuming and pointless so I use a way to estimate it, which as long as done the same way every time will show progress in the LT.