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My guess that is nothing to do with the concrete affecting the tyres but just distortion.
My granddad used to winter abroad and always had his car laid up which involved jacking it up on blocks so that the tyres were off the ground and didn't get flat spotted. All the chrome was smeared in petroleum jelly and covered in muslin too!
That could be all it is. I had an old Toyota truck that sat in my driveway so long it flat spotted the tires. Shook like a mother fucker until you warmed em up some and spun them.
Tires in general do just suffer from dry rot. I think 10 years or so is maximum recommended life regardless of tread depth, as long as you annually inspect them past 5...