About Clown's Pinkie Finger Addon
English is not my first language, but I think there is a difference in the description of this addon on the website and in-game.
in-game there is a line "Decrease Maximum carried bottles amount by 3"
If based on the in-game explanation, it means that if Clown get buff basic bottle increase to 6 (latest developer update), then it does not affect this addon because the maximum bottle remains 3.

Comments
I think developers will delete this add-on in ptp. They'll touch add-ons of these killers that's for sure
They did mention about Huntress, Pig, Hag addon on developer update post but they say nothing about Clown addon, But we'll see in PTB in a few hours.
Description from wiki is the correct one.
They need to remove this line "Decrease Maximum Carried Bottles amount by 3" from in-game description.
If it 5 as being carried permanently then it becomes 3 bottles when using this add on.
6 bottles by default (PTB), then -3 when using Pinkie Finger +2 purple addon = 5 bottles
before i confused by in-game description "decrease maximum carried bottles by 3" i thought this work like Huntress Irisdescent Head addon (max.1 hatched) but apparently not.
i assume they will make it so it decreases bottle count by 5 and not 3, shirley.