That I can agree with. It gives us the sense that we only exist in the present.Sorry but time can not be a dimension.
We only see one point of time
Fact is, we perceive our existence using our senses. And as we get our sensory information, whether external or internal, we perceive as the PRESENT INSTANT. We are such beings that we can get input information only one pattern at a time, so we can see only only point of time.
[Then I could be wrong, but at least I trying to see things differently.]