They believe they can win, partly based upon the District Council results in May.
To support that argument they posted this misleading meme.
I have annotated it.
I wrote some code in Node.js to extract the data from this PDF and put into CSV format so that it could be analysed.
The average vote per candidate and number of seats won per candidate are both higher for the Lib Dems.
Names in Bold show the three candidates elected for the ward.
Chailey here is an example.