Yes, this is okay item for poking (but after lane phase Kata, unless build tanky, is nuke character). I even did the math, goldwise it was always better to get another item than laundry when not going tankarina
Just out of curiosity, have you every played Kat with Liandry's? Cos it's not a terrible item on her at all. The small health gives you a little more survivability so that when you jump in, you aren't killed in 2 hits, while the MP and AP as well as the spell damage burn are enough to give you that damage boost you need. For how much it costs, it's actually a great item. Heck, sometimes it almost works like an auto-ignite. If you throw death lotus and someone gets away with almost no health, that burn will get them 3 seconds later.
Liandry is only good item on Tankarina. If you are going full ap and getting Liandry I must report you. Its too costy item to get and if you are playing Kata right the mask wont have the time to proc itself really.
Sorry, but with the amount of katarinas using it and doing extremely well with it, reporting them is kind of a moot point. Your opinion isn't really law, so I don't really see the need for you to report all kats using it, and even more obnoxiously, announcing on every single piece of art with a kat with a liandry that you report them all. Honestly dude, no one cares. Get over yourself. I start with Liandry's every time. and I gets triples. and quadras.