Your chart is an interesting way to look at weight loss. Thank you for posting a link to it. However, keep in mind that the chart presupposes that you currently know what is your long term goal weight.
Setting an accurate goal weight before weight loss surgery is almost impossible. For example, at my current post-surgery long term maintenance weight range of 177-180 pounds I look great, and both my primary care physician and my wife tell me not to lose any more weight; yet, technically, many ideal weight charts state that my ideal weight is 155-165 pounds. At that lower weight I would be way too skinny. Similarly, BMI calculations based on your height may result in you setting too low a goal weight. In contrast, many surgeons set goal weights that are too high - perhaps to reflect the fact that many people do not lose all of their excess weight after surgery or to make their surgical "success rates" look better.
Thus, what I have learned (by personal experience over the last 3.5 years since my surgery and by reading many postings here at TTF) on setting an accurate goal weight is quite simple. When you have your surgery set a provisional goal weight that you think is right for you based on your prior weight history and what your surgeon tells you should be your goal weight. Then lose lots of weight after your surgery by sticking to the diet, drinking lots of liquids without calories, and leading an active lifestyle. Once you reach your provisional goal weight (and you will if you really stick with the diet plan) then determine (in consultation with your PCP and other people who you trust) if you should lose more weight (or perhaps even gain a few pounds) in order to reach a revised goal weight at which you will look and feel both healthy and thin. It may be that your final long term goal weight ends up being very different than the goal weight that your surgeon gives you.
Keep in mind that in general people who have the sleeve lose weight a slower than people who have the gastric bypass. Also, in general men lose weight faster than women. But, and this is really important, what matters is not how fast you reach your thin and healthy goal weight, but that you do reach it and then maintain it long term.
I did not have weight loss surgery to lose just 70% of my excess weight or to regain weight after reaching my true goal weight. I had my surgery to reach a healthy goal weight and then maintain it long term. To me, failure is not an option.
We are here to support you on your weight loss surgery journey.