Mentioned this in a previous thread on the subject…
Yes, you do need a somewhat “not-lean” aka fatty meat.
BUT, if you would prefer NOT to totally close your arteries and need by-pass surgery by the time you are forty, do NOT use meat “with loads of fat on it”. Use just a slightly fatty meat and compensate for the lack of meat fat by adding olive oil (1/4-1/2 cup).
It may not be a completely PERFECT substitute, but it is a very good substitute, AND you’ll live to enjoy it a LOT longer!!!