Nothing has changed. If 2015 TurboTax did not inform you that this was an excess contribution, you either did not enter the W-2 correctly into 2015 TurboTax or there was some other source of compensation (perhaps your compensation if you were working) that supported the contribution.
If there was no compensation in 2015 to support the contribution for 2015, it's an excess contribution subject to a 10% excess contribution penalty every year that it remains in the account, six years so far.
