Also got the text, and I think it is real. I am flying our of MSP Monday, and the airport is remodeling a major portion of the security area, so long delays (unless you have precheck or clear), according the local newspaper.
Perhaps Delta just sent it to too many people...
And from another thread, this email has gone out as well:
Dear Delta Customer,
Please be advised that the TSA South Check Point at MSP Airport is currently under construction and will only offer 2 TSA PreCheck lanes. We recommend that you use TSA North Check Point for Standard, SkyPriority and additional TSA PreCheck lanes.
Thank you for flying Delta.