Source: p 22, Chapter 4 entitled 'The Garden Path [line break] EPICURUS'A Little History of Philosophy (2011 ed; but Reprint ed, 2012 extant) by Nigel Warburton PhD in Philosophy (Cambridge)
Imagine your funeral. What will it be like? Who’ll be there? What will they say? What you are imagining must be from your own perspective. It’s as if you are still there watching events from a particular place, perhaps from above, or from a seat among the mourners. Now, some people do believe that that is a serious possibility, that after death we can survive outside a physical body as a kind of spirit that might even be able to see what’s going on in this world. But for those of us who believe death is final, there is a real problem. [1.] Every time we try and imagine not being there we have to do it by imagining that we are there, watching what is happening when we’re not there.
My challenge of 1 means my misunderstanding of it: Why is 1 true? Please see this question's title.
Suppose that you despise the notion of, and so wish to imagine your absence at, your own funeral. Then you can cease thinking about anything resembling your funeral as follows, for example: As soon as you imagine a funeral home, church, or crematorium or cemetery chapel, you can stop yourself by thinking instead of anything joyous (like the kind people here at Philosophy SE).
Does the above disprove 1?