Forum:Overload fusion question

HI and srry to disturb you , me and my friend were dueling and then he used overload fusion to summon Chimeratech Overdragon. but i wasent sure if it could work since the requirment are cyber dragon + 1 or more machine. can he even use machine type monster in is graveyard even if they arent specifically listed on chimeratech ?

thank you XD