Enterprise Infrastructure - EIGRP Classic Metric Calculation lab solution mistake?

The solution to this lab does not result in traffic between Host9 and Host10 using R3 and R5 bi-directionally.

R7 needs the following added:

interface GigabitEthernet0/1
delay 999999

And on R3, the solution will result in traffic from Host 10 to Host9 being sent to R1, so the below delay shouldn’t be added to Gi0/3:

!
interface GigabitEthernet0/3
delay 9999999
!

I have tested to prove that this is the case, but please confirm. Thanks.