How to "add" multiple items into one sitemap string

Happily, you don’t need the linked code for your purpose.
in .items:

Date myDate ... {...}
String mySeason ... {...}
String myFullDate "Date: [%s]" //no Binding needed

in .rules:

rule "update myFullDate"
when
    Item myDate updated //or
    // Item mySeason updated // not needed, every time season changes, date changes too :) 
then
    myFullDate.postUpdate(myDate.state.toString + "(" + mySeason.state + ")") //mySeason should be string already
end

Now in sitemap you only need to use myFullDate.

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