"... where the speed of light is faster ..."
Garbage.
Do you have an explanation for your one-word reply, or do you simply dismiss any scientific musings out of hand?
"Variable Speed of Light" Theory has been around a while.
not just garbage...
"... where the speed of light is faster ..."
Of course, since we can't know the properties of another dimension or alternate universe in advance, the speed of light might be 3 mph.
Garbage."
Very probably but tachyonic drives are are a very (as in very, very) hypothetical idea that utilize a flow of particles that can go no slower than light speed but are unlimited in terms of top speed.
So far though, "garbage" seems to be an astute analysis.