well, 14 days with 225 calorie increase equals a total of 3150 calorie surplus, while 900 calorie deficit for 7 days equals 6300 calorie deficit which totals to a fat loss of 3150 over the course of 3 weeks while hopefully gaining muscle strength and size as well.
Yes significant muscle gain takes longer than 2 weeks, but immediate muscle gain following exercise is more debated how long it takes. we have the olympic athletes training multiple times a day saying how a muscle can recover withing 5 hours or so if you just keep your training under a certain timeframe, while we have the majority saying 48-72 hours and then the hardcore bodybuilders saying it takes a week. lets say it takes 48 to 72 hours, following that logic the muscles you trained on friday you should have recovered before you eat a calorie deficit on monday and you should keep the gains you made trough that week.
That is of course if you dont make any gains during your fat loss week. it might entiry be possible you will make some gain when taking into account the supercompensation effect that can occur following the 50% reduction in volume and that 7 days might not be long enough for the body to downregulate the anabolic envirement in your body. you are suppose to hit your muscles really hard during the 2 weeks you bulk.
as far as fat loss takes longer than 1 week, that is not true. the body is constantly taking out calories from you fat cells and replacing them with calories from food, all the time. whether you are on a deficit or not. fat loss is just the results of more calories being taken from fat cells than coming inn from food to replace the emptied fat cells.
it has to be repeated of course that i dont have anything against the normal bulk/cut thing IF you can mentally and physically handle it. but i cant, i have no problem sticking to a diet and getting my macros, but loosing strength and seeing my buddies go past my lifts, and having other people see me not getting stronger just sucks all the fun out of lifting for me and makes me hate going to gym which results in even more muscles loss and the end product is just me spinning my wheels .
so i look for other alternatives and this makes a lot of sense to me, i count calories pretty accurately and i personally have no problem with a lifestyle like this.