Dyson must have already took the 969944-04 off their website.

969944-04 can still be purchased elsewhere online. For example amazon.

https://www.amazon.com/Dyson-V11-Floor-Part-969944-04/dp/B07XK9M3WW/ref=cm_cr_arp_d_product_top?ie=UTF8

https://www.dyson.com/support/journey/spare-details.970778-01.349720-01.html