If you lie about your iPad Mini 2 having Touch ID , Apple’s trade-in partner is going to actually check and assess this iPad and is going to discover that your iPad does NOT have any Touch ID and will only credit you the 10 dollar amount, then, when they have recieved your iPad or will in some fashion recoup the fraudulent additonal $70 dollars you claimed for trade by lying about your iPad Mini having this feature.
Why create possible additional aggravation for yourself, in the near future.
If you wish to try and commit some sort of fraud, about the actual features of this over 7-year old iPad, then that is your own decision/concern.
Apple's trade-in partner IS going to thoroughly check out and assess your traded-in iPad and discover for themselves what features your iPad Mini has, or not.
Your iPad Mini is simply too old.
Sorry