I made a throwaway account early last year to test memory editing for the game, and using this modded apk (plus game guardian to max attributes and friendship etc... and to skip tlsq 24 hour timer) I progressed from year 1 to year 7 in about 2 months. I bought all of the pets and clothes from the shop using the gem cheat, and most of the creatures (the ones with a story quest at least). I also used the gem cheat to buy from brilliant bargains and to get the keys for magical milestones every month.
I still have the account now, and have never been banned on any of my accounts. While I can't say that you are 100% safe from getting banned, I can say that so long as you don't log in during a group event, don't store massive amounts of energy, and don't contact support in any way, you should be as safe as is possible with this mod.
Okay if you don't mind, by massive amounts of energy, do you mean days and hours passing with more than 600? because sometimes awards pile up fast and you end up with more than 600, but i heard as long as you spend it right away, it's fine?