+1(514) 937-9445 or Toll-free (Canada & US) +1 (888) 947-9445
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I got an additional document request on 20 of June and I've uploaded what they asked for on 22 of June:-
- Updated Bank statement
- Updated Employment Letter
- Updated LOA as I already deferred from May to Sep

Do you think it's a good sign to request those three additional documents after more than 4 months without an update?

It's a good sign if you think this means at least someone reviewed your application and decided to ask for updated documents. Now, will this mean that you will receive a decision soon? Who knows... Today starts week 17 since I've submitted my application and not a single sign from IRCC.
 
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