From an email from 86 400:
Effective Sunday 1 November 2020, the maximum balance on which bonus interest is paid will change from $100,000 per Save account to $50,000 per account, to a maximum of $150,000 per customer.
There's no change to your interest rate, which remains a competitive 1.60% p.a. (base rate of 0.15% p.a. and bonus rate of 1.45% p.a.). There's also no change to the way you earn bonus interest.