Well done for highlighting this!You will damage the bearings unless you either use the tool on or off the car or machine suitable sleeves to use with the press
The basic principle is that you must only apply pressure on the ends of the OUTER race only
If you use a press without the sleeves then you will apply the load to the hub which in turn will apply the pressure through the balls to the outer race. This WILL damage both the balls and the race ways
Btw watch out for the fake skf bearings particularly on eBay they are VERY convincing fakes but one of mine lasted a mere 4000 miles and the sellers 2 year warranty was not worthy the ink in printing it- buyer be ware comes to mind
Paul
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