You're right. Words mean things. That's why Rick is suspending his campaign. It's a word with a very specific legal definition and status that means he's allowed to continue to accrue funds to retire his campaign debt. If he ended his campaign, he would not be permitted to do so.
Ok,so when will he be getting back in the race? Under what conditions will he "reinstate" his campaign?
Obviously, he won't be getting back in and under no circumstance will he "reinstate" his campaign. Once again it's over. He has ended his campaign.
The legal loophole you describe does not change the meaning of "Suspend" or "End". What Santorum just did is END his campaign.
If Rick were in a court room you might have a point but that's not the case.