When has an artist reached the goal?

The definition of the point of time when an artist has officially reached the goal is not only important for the artists, to mark this date in their calendar. It is important for believers, too - after that, I learned today it is forbidden to remove parts even if the option is still offered! And it seems to be very, very important for Sellaband, too!

So far, I though it's very simple and easy: An artist has officially reached the goal on Sellaband as soon as the artist doesn't appear on the "fundraising artists" list any more, and/or isn't listed under "I am funding", but under "I have funded", in case you have a part in this artist.

Seems like this is not enough. Being a honourable person, not wanting to violate the T&Cs (I'll better leave that to the two other envolved parties different from the group of the believers :-) and removing parts illegally, I would like to know what exactly the conditions are - and how it is visible to an ordinary believer like me.

You could think that once 100% is reached, the artist has reached the goal. But there are these "plan changes", which creates artists having 100%, but they don't have the goal reached, and you are allowed to remove your parts - though it's not visible on the artist at all.

So: Do I have to check my emails announcing the plan changes, and calculate the date until I'm allowed to remove parts on my own? And what happens if I didn't get that mail, because I became a believer later. Am I allowed to remove my part in this case at all?

Thank you!