If you are doing the program honestly, you will be very hungry. Resting maintenance for me is ~2600cal & when I first started 20rep squats I needed almost 4k on workout days & 3200++ the next day or I felt famished. Plan on eating every 90min on workout days. Get a minimum of 1g of protein per lb of bodyweight.
The goal of the 20rep program is to gain weight, so for the 6weeks you hammer on it, eat accordingly. If you are looking to diet or re-comp or scared of gaining some chub, maybe try a different program. Done properly, you will get stronger, thighs will get bigger & you will gain scale weight.