Batten Under Toilet within floating floor?

Howdy folk, putting my floating floor into a downstairs WC currently,

Concrete subbase, 100mm PIR then 2x Chipboard.

Noted on the kingspan site they state to use timber battens on both door transitions and also baths n toilets etc. I figure this makes sense as you don't really want a bouncy toilet.

What i'd love to know is what / where and how you can have a batten in the floor there? Cut a square out of the insulation and make a 10x10" batten box to sit in the middle of the insulation and put another square of insulation in the middle? Seems hilarious but maybe it's a simple idea?

Or Run another bottom plate from wall to wall perpendicular to the toilet and put a lone joist in the floor, effectively splitting the floating floor in half (might actually help as it's not level!) or even just ignore the advice!

Would love your thoughts.