Yes. Since the rate is now variable and linked to the 91-day T-bill rate, it may change when the T-bill rate changes.
Fido will always keep you informed of the applicable rate changes.
What does a variable interest rate mean?
A variable interest rate means that the rate is not fixed at one percentage.
Since EasySave is linked to the 91-day T-bill rate, changes in the T-bill rate may change the interest rate you receive on your savings over time.