That states literally nothing about engine break in procedure. I do agree with you on having a quality motor oil, my company recommends vr1, brad penn, amsoil dominator, various joe gibbs oils, and the higher viscosity grades of royal purple XPR to be used with a few others (to retain a warranty on our products) based on our torture testing. That being said, it makes a blistering 23whp per cylinder if he is lucky, it's not exactly seeing a lot of pressure on the bearings, assuming the cam lobes are seeing adequate oil volume of decent quality oil, there isn't a lot of likelihood of something going horribly wrong on a stock motor that likely still has a factory fresh valve adjustment.
That being said, the zddp content of rotella or delo is significantly higher than the average automotive oil to the extent that it should do very well on flat tappet cam setups.