Dr. Craig is a liar.

[Time Traveler]

Here is the Merriam-Webster definition of the word "Previous"...

1 : existing or happening before the present time
2 : earlier in time or order
3 : immediately before in time or order

William Lane Craig has you are locked in a temporal hell. The word "previous" is synonymous with "prior." Every time you attempt to define God existing "timelessly" prior to/previous to (take your pick) creating the universe, you fail... by definition!

It is only because you cannot defend a past infinite regression that you must defend such obvious absurdities! But you are really only trading one paradox for another. Out of the frying pan, into the fire.

There is an event that marks the change from one state to another--therefore establishing the difference between previous and the next states and therefore a "timeline". There is nothing incoherent about that.

You are correct, there is nothing incoherent about a "timeline," UNLESS you are idiotic enough to insist that one of those states on the timeline is... timeless!

EDIT: And it is equally ridiculous to assert that one of those elements on the timeline is actually prior to the beginning of the timeline itself.