I found this issue intriguing, and remembered Thomas Elmiger's Compare 
if-then-else Style in Wikitext 
<https://tid.li/tw5/hacks.html#ifAisB%20%E2%80%93%20Compare%20if-then-else%20Style%20in%20Wikitext>

So this should also work - meaning it finds and lists Data Tiddlers that:

   - have an index named:  *validateAll*
   - that has its data: *true*
   - and as a bonus, it makes a link to the tiddlers


\define make-link() <$link to="$(display)$">$(display)$</$link><br>

<$list filter="[type[application/x-tiddler-dictionary]]" variable=dataTid>
<$set name="display" value=<<dataTid>>>
<$set name="data" tiddler=<<dataTid>> index="validateAll">
<$list filter="[<data>] -[[true]]" emptyMessage=<<make-link>>>
</$list>
</$set>
</$set>
</$list>



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