Hm, maybe...

Maybe they just want to see a reaction from you. [shrugs]
Or it is a badly thought-out plan to draw you back here?

[Laughs a little at him being his grumpy but still friendly old self.]

[No, he probably wont. Others often tend forget about his birthday,
partially because he doesn't make a huge deal out of it
and also usually celebrating with his citizens is fun enough for him.]