Huel is low glycemic index, and many of us have used Huel as part of a body fat loss program.
However, I doubt you will achieve ketosis while using Huel. 40% oat powder, by weight, oats are the biggest ingredient. I mean, even if you only had one 2-scoop serving a day, there’s enough carbs in that serving that you’d have to painstakingly watch everything else you ate that day to ensure you didn’t exceed the 25 or 30 gram limit of carbs per day to achieve ketosis. And in that sense, your intake of Huel would be so limited, you’d still need to buy other food for the majority of your total food intake, and it would defeat the purpose of ordering Huel in the first place.
Realistically, Huel is not a practical option for ketogenic diet. It can be used successfully for body fat loss, just not via ketosis.
Just out of curiosity, what is your height, if you don’t mind me asking? Those weight numbers you mention don’t seem that high. I’m 5’ 11" male. I weighed roughly 215 lbs last year. Last time I stepped on the scale I was 194 lbs. My goal is to get into waist size 36 pants which will put me somewhere in the 180 to 185 pound range, roughly. The ideal body weight for me is like 170 lbs, but that ain’t happening 
I’ve been reading a lot about intermittent fasting and have started practicing the 16 hour daily fast for a few weeks now. For me, intermittent fasting frees me up to be able to eat whatever I want during the 8-hour feeding state. Now, that doesn’t mean I’m going to be eating stuff that I clearly know is junk food. But what I I mean is that I don’t have to count calories or count carbohydrates or worry so much about what I do eat during the FED State. My main focus is trying to go 16 hours from dinner to next day’s breakfast. I use Huel at work for it’s convenience and it’s low GI.
Remember that the one goal of a ketogenic diet is to lower your insulin. If you are practicing some form of intermittent fasting, your insulin levels will be very low deep into the fasted state. So, you can get benefits from just practicing fasting and not necessarily also eating a ketogenic diet. But doing both will be even more effective. Depends on what you want to achieve and how quickly.