I took a lot at that anemone today.
Can't be 100% sure that it is dyed, but I am leaning that way. The ends of the tentacles were yellow, whereas the lower 2/3s of them were bleached.
If you have never kept an anemone successfully ( 2 years or more ) I would suggest that you pass on it.
If you have kept them for successfully for 2-5 years I would still suggest that you pass on it.
If you have successfully kept them for 5+ years, it would be your call, but I wouldn't expect it to make it, but might be worth a try if you are willing to but in the time and effort it would take to bring it back from the condition that it is in.
To be honest I thought about it (( but passed because you asked about it )), but right now I just can't give it the effort that it would require to bring back to a healthy state. In a couple of months I would try it, but would have very very low expectations.