If I know I'm going to have to put a speed on early then I always give an indication of what I'll need. eg. Plan on a 280kt descent or whatever I decide . At least then you have some idea to plan your profile.
If there's holding at LAM I can't really undertsand why they would still need the 150 at SABER as that is there to ensure you make Min Stack at LAM and 250 kts. If there's holding you wouldn't need to achieve Min Stack.