According to
DCL (the horse's mouth),
NO.
The lady we spoke withsaid they
USED to do it that way and no longer do.
She said the current process is as follows: DCL will release 50% of all available reservation times/slots at the first booking window, 105 days prior to sail date (Concierge Cat 1,2,&3 and REAS). This accounts for ALL of the booking slots that will be obtainable ONLINE. They are not replenished at 90 and 75 days, and once gone nothing further wil be available prior to sail date unless there is a cancellation of a previously online-booked slot.

The remaining 50% of time slots will be available for booking on a first come-first serve basis upon boarding the ship.
If you follow the main board you will see frequent posts of cruisers griping about no Palo available when they get to their booking window.

And according to what Brandie posted yest. tea has one spot, brunch four, and dinner slots are available every evening. So tea=impossible, brunch=difficult, dinner=easy.
FWIW, we have had to do the "ressie scramble" onboard both of our prior cruises. It took about 1/2 hour (we were in line when they opened) and we did get what we wanted (brunch & dinner) on the day/nights we wanted but not at the time we wanted. So not all is lost if you have to try onboard....just the planning isn't as easy!