This is absolutely what she is doing, she’s mentioned slider foods before and I’ve just found this in a blog post she wrote: “Weirdly I can still eat chocolate and sugar without it making me sick, and crisps are a ‘slider’ food meaning that I don’t get full on them and can eat them for ages.”
In the same blog post she says this:
“Whilst I can only eat much smaller portions, I still have to watch what I eat. I could still eat rubbish all day if I don’t actively make healthier choices. Weight loss surgery is a tool, and I am still working on my mindset and finding non-food rewards and comforts for when life is challenging.”