I don't think it makes a difference, in the end so long as you have a calorie deficit, you will lose weight. Though it *may* take a little longer this far out.
In maintenance, I had a couple times when I gained like 5-6 lbs after a period of eating too much or a period of decreased activity. The first time this happened was maybe 11 mnths post op and it took me a week to lose it. The last time it happened, it took me almost 2 months (at almost 2 yrs post op). It was much easier to go low cal before than it is now, probably cuz I'm used to eating more now?
Anyhoo, its not impossible, Keto/low carb or not.
Good Luck!