They only have to comment on the algorithms for Step 6 and don’t need to call them to run. It is a bit strange but that step is included to cover the outcome 1 theory parts.
I don’t even get them to comment on the code for step 8 as they have just explained a Counting Occurrences in step 6 or do testing as that evidence comes from first version of the program.
I just check work against Judging Evidence tables – no point them repeating same evidence again.