Your workout is fine for lat width, the exercises at least. I would put zero faith in ANYTHING a fitness show has to say unless it were hosted by Ronnie himself. A lot of times instead of saying "Do dead for back thickness" they say "Do supinated super-setted cable tri-curl rows for thickness!" Like if they don't make it complicated no one will believe them.
Some of your taper is genetically predetirmined. I have heard rowing movements help with thickness and chins are for taper but I do both anyways and don't separate the two different movements. Just make sure in the rowing movements you feel it in your lats; there is definitely a way to just do the movements, and a way to really hit your lats.
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