Seems the content of welcome page is a website page... Maybe it is not supported by SWTBot now.
And, if you want to see some sample test codes, you can try to open the Perspective menu using the following codes.
bot.menu("Window").menu("Open Perspective").menu("Other...").click();
bot.shell("Open Perspective").activate();
bot.table().select("Debug");
//bot.table().getTableItem(2).getText(); //Get the 2nd line text of the list.
bot.button("OK").click();
Hope the code is useful for you.