1) After 20 years off bikes, make sure you spend as much on your safety gear and additional training as you can afford. No matter how good you think you used to be, this bike has the same power, more torque and better handling then the Ducati 916 from 20 years ago and that was a bike that demanded your attention.
2) 4 degrees Celsius is not a problem. 4 degrees Fahrenheit? That is -15 Celsius. That will kill your battery really quickly so use a trickle charger or disconnect it and bring it indoors. -15C is pushing the limits of protection your 4 year old coolant can provide and is much lower then your engine oil can protect. Do NOT start the engine. Wait until the thaw (and then wait some more) until it warms up naturally and give it a very careful and thorough examination before doing anything.
3) You might have a typo. The MTS950'S' wasn't introduced until 2019.