Did John Lennon ever adress the criticism that he sang of no possessions but lived a millionaire lifestyle?

He did talk about it in his Playboy interview with David Sheff in September 1980. (It's one of the few at-length interviews Lennon gave before his death.) The gist of what he says then is that there was a point in his life where he felt that he shouldn't have all these possessions and should help the world out. But he came to realize that it was impossible to escape and it ultimately wouldn't do him or anyone else any good in the long run:

PLAYBOY: John, do you really need all these houses around the country so you can have a place to get away?

LENNON: They’re good business, but we do love them and use them.

PLAYBOY: Why does anyone need a hundred and fifty million dollars? Couldn’t you be perfectly content with a hundred million? Or one million?

LENNON: What would you suggest I do? Give everything away and walk the streets? I wasn’t content with no dollars, I wasn’t content with a million, and I’m not content with a hundred million. Contentment doesn’t lie in money.

<snip>

LENNON: My insecurity is having too many clothes. That’s a physical manifestation of my insecurity—a closet full of clothes I cannot possibly wear. But I understand it. I still have the clothes and I still dump them on the Salvation Army once a year, whatever. But I understand the neurosis. But having a lot of money is no longer a problem for me...

<snip>

...I do know it’s not a matter of how much gold you have in your pocket. There are many awakened very rich people and many awakened people who don’t physically own anything. One bowl, one cup. What is it? The Zen thing? One bowl, one cloak. For me to do that would be pretty crazy—to just walk away from it all. That means no possessions, including your family and ties and everything. That’s that extreme. But to walk away would be walking away from responsibility. It’s like the Beatles. I can’t walk away from the Beatles. That’s one possession that’s still tagging along, right? No matter what I say. If I walk away from what I am, whether it’s two houses or four hundred houses, I’m not gonna escape it.