This is absolutely the correct decision: Trump is not immune from prosecution in his 2020 election interference case, US appeals court says [1] (AP).
No one is above the law, not even the President.
Trump will no doubt appeal this decision, but my guess is the Supreme Court will refuse to hear the case, thus affirming this lower court decision. This means that the various criminal cases against Trump will proceed, although it remains to be seen when these cases will be tried