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You only put the readme.txt in tags/1.0.1. But the entire plugin with all its files has to go there, just like you already did with tags/1.0.0.
And in SVN under assets there is still only the 1st screenshot file. But you have to upload them all there so that they are even there.
As soon as you adjust this, the system should determine after a short time that 1.0.1 is complete, which means the output should then also be complete.
No, the files are not there. See: https://plugins.svn.projectdmc.org/instant-search/tags/1.0.1/
You also have to transfer them again via SVN, not just store them locally.