"Tip ejection" is actually just as it sounds: the tip has to eject from the bullet! Unlike the VMAX that has a hollow space for a harder tip stem to ram into softer lead core which splits the core inside out. A copper monolithic is different and, unless you're using a harder tip (brass, steel) and a shelved/stepped internal design like Peregrine does, cannot be "opened up" via the tip.
With a copper bullet like the hammer, TTSX/LRX, or badlands, the tip is bent out of the cavity upon impact due to the fact that no bullet will continuously encounter exactly perpendicular forces against its meplat at and after the point of impact. What you'll see with an aluminum tip is that the stem of the tip will be bent while the pointy end is generally intact.
As far as tips allowing for faster terminal transition, theoretically they shouldn't because they're blocking the way. Realistically, they can and should be intentionally designed via modification of the tip length, stem length and fit, to facilitate terminal effects at the depth necessary for performance against the game you intend for your bullet to be used. Also, the tip allows the most aerodynamic meplat to be used in front of a larger hollow point cavity, so faster terminal performance is easily achieved without hindering external ballistics.
TL;DR
Ballistic tips are one of the most important ballistic innovations in the modern era! Nearly as much care needs to be put into designing their dimensions as is placed in designing the bullet that they're plugged into.
