Anderson has been making that speech for 40 years. It can be either taken as him not thinking Felder copied them or that he thinks they did but doesn't want to go down that road - so just has a poke at it being a "tribute".
The only issue really is that Felder was not with the Eagles when they toured with Tull - but he could have been in the audience.
Felder has also said he's never listened to Jethro Tull - and only knows of them as a band with a guy on flute.
I don't believe him.