Generally, what he means is to "tab" until you get to the indentation level for an ordinary line at that point, then use spaces after that for justifying continuation lines. E.g.:

# "--->" is a tab and "." is a space:
--->{
--->--->if ( really_long_condition_here() &&
--->--->.....another_really_long_condition_here() )  # see spaces on t
+his line
--->--->{
--->--->---># do stuff here
--->--->}
--->}
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That way, you can adjust the tab display size, but the alignment is preserved.

I personally can't stand it, but that's the approach the tab-advocates suggest.