The bonus and referral system always changes and the security makes some proposal how to change it, to make it more stable and to decrease cheaters opportunities.
You're right, this talks about updating their security network within a close time interval that can make it hard and more difficult for their system to get abused by hackers and bonus cheaters in finding a route to enabling some functions whose access had already been disabled by the casino, i also understand that doing this may be demanding both technically and financially but there must be a cognate understanding to why this is needed against hackers because if they eventually got the system abused, everyone will be affected including the innocent gamblers.