Limit Guest View Thread

Is it possible to make limitation thread view just for one paragraph without addon ?

thank you

Remember that if you limit the thread view for guests, your forum will not get properly indexed by search engines.
 
Remember that if you limit the thread view for guests, your forum will not get properly indexed by search engines.
Is this true?
I thought the addon that did it well, allowed google bots without problem, which I thought meant indexing will not be a problem.
 
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