Variations on "way to go" are pretty common these days. You can read it (in this example) as him sarcastically saying "Yeah! Well done on such great research". He is suggesting that Khachanov is wrong to say that he (Kyrgios) just plays video games all day and that, if he had done his research better, he would have discovered that Kyrgios does a lot of charity work.
"Pelican" here is used as a derogatory term. Even though it's not a common use (in BrE, at least), it's clear from the tone and from the preceding words "you absolute" that it's meant rudely.
There's a British stand-up comedian, whose name I can't recall right now, who did a whole sketch once about how you can put just about any noun after "you absolute" and it comes across as an insult. For example:
You absolute plughole.
You absolute crocodile.
You absolute telephone.
The speaker's tone of voice and the content of the rest of what they're saying would make it clear that it's an insult, regardless of the noun.