The 8k requirments are broadly written. U have the right to interpret it anyway you want too. In the past material events such as the MTA with Apple, Milner knives and the swatch agreement have all garnered an 8k. So Ill leave deductive reasoning to you.
I dont follow Apple like I do LQMT so I dont know what they file 8k's for. Im sure they get leagal counsel before they file or dont file. At the end of the day it is up to the SEC to determine if a failure to file a 8k in response to a contract is a material event.