I would talk to Caliburn, to make sure. Orochimaru bio's have several restrictions that would need the approval of either an RP mod or Caliburn himself. As for customs, new rules where made regarding them so again, I would either check the role play updates a new rules or talk with an rp mod directly about them.
Trainings don't end or get revoked because of how long you became inactive nor do bios. But that link is wrong as that bio was never approved. You currently have two approved bios:
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- Orochimaru
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- Dodai
Remember that if you drop Orochimaru, with the new rules, you might not be able to remake it. But like every old bio until you "mess" with it, its still valid and approved and can be used.