All guideance reports are material in nature. It's because the information provided will have an effect on future results.
The whole reason for guideance reports, is so the market is better informed on the companies progress. This gives investors the information they need to value the company and make a decision to either buy, hold or sell a security.
Isx will definitely update the market as stated. It has an obligation to report material effects that can impact a companies securities.
