Actually, he's not that knowledgeable. What he's proposing is an old school protocol. Not that once per week test dosing doesn't work, it does for many but shorter protocols such as every 5 days for your 100 mg shot or splitting it to 50 mg every 3.5 days will usually work better and provide much more stable levels.
His logic of using the HCG at the end of the week is to bump up endogenous T production to offset your waning T levels. Remember T has a half-life of about 5 days or so (metabolism dependent) and this is where that logic comes from.
Taking clomid alongside exogenous testosterone will do nothing for you as it cannot overpower the injected testosterone and initiate it's function in your brain (LH/FSH) and thus downstream production of testosterone, estrogen, etc. I can explain it more in depth if still not sure. HCG on it's own will preserve fertility for you. Studies show this. I've attached one below. Read the section on HCG:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4378070/
I give him credit for trying though. Better than most! Overall it won't hurt you but it can definitly be improved on.