I feel like I should clarify because the article didn't do a good job at explaining: perovskite is a kind of structure, not a particular material. They have the generic formula ABX~3~ (where A and B are different kinds of cations and X is some kind of anion), although not everything with the formula is a perovskite.

Simple perovskites include some lead-containing materials like lead titanate, but also lead-free materials like barium or strontium titanate. And in general there are a lot of different kinds of perovskites, especially because some of the structural sites can be filled by small organic molecules instead of pure elements.

Edit: I think I was misreading the journal article before my edit (it's early I'm not awake yet lol). I had said it looks like they're using a lead-based perovskite but actually I can't tell what exactly they're using with a quick skim. The article is very review-y, the formula I thought they were using is from another paper. I'll have a more thorough look later.

Edit 2: It's a review paper, and the way it was described in the linked news article is kinda misleading. Its not specifically about this company's particular composition or architecture.