I'm going to talk about it a thread I'm going to update soon...but my short answer is NO. I've been getting ripped again after doing a lean bulk/maintenance all winter and while I try to eat lower carbs on off days(and sometimes on training days) a lack of discipline is leading me to eat more carbs than I intended. And you know what? I'm still getting lean.
Some days I eat upwards of 400 grams and my muscle retention has been better this time around. I'm at the same level of leanness as this time last year, but I'm about 4 to 5 pounds heavier. The main difference is I actually enjoyed carbs this time around.
Now, if you are above 15% body fat and can't even see a blurry six pack, I would recommend going on the low side with carbs...but it would be higher than 50grams because you need energy to fuel workouts. I'm finding that's more important than what carbs may or may not do to your hormones/metabolism. I think having beastly workouts will do more for overall fat loss than cutting a whole macronutrient out.
Calories in vs calories out rules. As long as your macros are balanced don't sweat how many carbs you eat.
I'm going to also add some tips and tricks I've learned to help me get lean when I update my "getting to the next level of shredded" thread. I'm not certified in anything, but I've learned quite a few things about controlling my fat levels during my three year journey of self-experimentation.
the thing that bothers me about keto -- which I know works for a lot of people -- is "what happens when you stop doing it?" Is keto sustainable for a lifetime? Not being anti-keto, but the law of thermodynamics still applies to the people who do it.