I would say what you are describing isn’t Intermittent Fasting just a low-calorie diet. I wouldn’t think that any of the benefits of fasting would apply but you would probably lose weight if you are in a calorie deficit.
A lot of people in this community have shared their positive changes besides weight loss so for me it’s definitely more than calorie control.
On a general level, here are some baseline benefits of IF: https://www.healthline.com/nutrition/10-health-benefits-of-intermittent-fasting
IF works by clumping all calorie intake together, to send a false signal of abundance to the body, so that the body does not down-regulate metabolic rate to account for reduction in calories. This is why IF is superior to regular dieting as follows:
With your plan, you would disable this core principal, so you are basically just doing traditional calorie restriction, and missing out on the 2 above.
If gym is a big part of your plan here, you might want to try r/leangains instead. They specialize in tailoring IF for high gym workloads.