Nooby question but how fast is the pace for intervals and repetitions for 5k training? Are intervals like race pace and repetitions a bit faster?
Years ago, "intervals" referred to the recovery/rest periods between the reps. Now "intervals" and "repetitions" and "repeats" have become synonymous. Some folks still fight to keep the old definitions, but that battle was lost years ago.
Hey, I am as annoyed as you when established terms are used incorrectly. I am annoyed by improper grammar, too. The ubiquitous "I have ran ..." and "I seen this ..." on this site are like finger nails on a chalk board for me (ha! do the latest generations know what that means?!). But languages are dynamic, and word meanings change over time. Grammar rules evolve, too. For instance, hanging prepositions were acceptable in English until the Classical Revival of the 18th century; my understanding is that because they are impossible in Latin, the rule-writers banned them in English. Now, in the 21st century, most people ignore that rule once again.
Just because some people call things by there incorrect name for a long time does not make it true. What Daniels is actually saying when he incorrectly calls reps intervals is what he means is reps at 5k pace, and when he says reps, he means reps at mile pace. Just because a large amount of people call something incorrectly for a long time does not make it true.