Do 1:1 means that Exereum blockchain will have exact copy of Ethereum blockchain at the fork height?
Yes it will be as mentioned in OP they will make exact copy of the ETH blockchain on giving time frame. I think this is interesting plan to get some tokens for free and if they will get succeed to deliver than it will be win win situation.
That doesn't seem to be very good since Ethereum blockchain size is already over 1Tb. So it takes forewer to sync Exereum chain straight from start?