There isn't anything mentioned for pool refurbishment at the DLH listed. This comes up when I click on the "See Details" link:
Please Pardon Our Pixie Dust
From February 2 through fall 2020, it is possible that you may see and hear construction as we make improvements to the
Disneyland Hotel. To minimize any disruptions, activities that may create noise will not start earlier than 9:00 AM. Some Guest rooms will not be available during this time.
To learn more about these refurbishments, please call (714) 956-6425. Guests under 18 years of age must have parent or guardian permission to call. All construction and reopening dates are subject to change.
I hope you find out more info.