Jesus did not die for all of the future sins of everyone. What I mean by this is that He did not die for willful sins that will be committed in the future by those who have believed in and known the truth. This is evident in Hebrews 10:26-31.
If someone is born again through the knowledge of the truth, and then turns from the holy commandment delivered unto them (see 2 Peter 2:18-22), their latter state is worse for them than in the beginning. It would have been better for them not to have known the way of righteousness.
Did Jesus die for their future sins?
You commit Willful sins on the regular, You just have trouble admitting it...
1 Peter 1:5 Applies to Christians
Jesus died for All sins
2 peter 2 is talking about False Teachers and their destruction. These are people who profess to believe in Christ but bring all types of heresies into the church. They tried to oppose the Gospel as an example when the Gospel teaches Jesus died for your sins they might teach not all sins or not future sins, So no it doesn't apply to them they where not saved and lost there salvation they where never saved in the first place they where imposters, When they came into the church they crept in where ungodly and denied the Gospel, Also the ones that follow them end up worse than they were at the beginning.