According to the CBC, Winnie's red blood cell numbers and her platelets are low. He needs to have another CBC run to check these values. Sometimes this is related to a mechanical error and sometimes it's a true problem which needs treatment asap. Anemia (low red blood cells) and thrombocytopenia (low platelets) can be indicative of an autoimmune condition (which could be cause by several things) and this requires treatment right away. I recommend to call your vet asap and discuss the CBC results and next steps.
It's hard to say if the meowing is related to the CBC results. cats will meow for many reasons:
https://www.petcoach.co/article/top-6-reasons-why-cats-meow/https://www.petcoach.co/article/5-cat-sounds-and-what-they-mean/There is not a way to stop meowing but if the meowing is due to stress or boredom you can try enriching the environment. Here is a great article about cat's instinctual needs:
https://www.petcoach.co/article/why-every-cat-needs-a-place-to-climb/Use a Feliway diffuser, set aside 30 minutes a day for vigorous play (really get him moving) and/or switch the food to Royal Canin Calm. Try feeding him out of a food puzzle. Hide food for him to find. Provide a stand or resting place by a window so he can look outside.
You may also try clicker training him for positive behavior. Here is a link about training cats:
https://www.petcoach.co/article/can-i-train-my-cat/Most cats response best to combination therapy. The veterinarian can also prescribe medications which can help with bad behaviors.
Do not start any environmental enrichment or play without first having the CBC results addressed. Cats with truly low platelets can bleed easily and they could die from this so ALL trauma MUST be avoided. I hope this helps and please feel free to post any additional questions.