Building 7 Transistor Logic Gates using And, Or, Exor and Inverter
Just check it same as before.  The signal between the AND gate and inverter is still there, whether it drives the inverter input or not.

By the way, real NAND gates aren't always made with a AND gate and inverter.  Take a look at the circuit of a TTL NAND gate and you will see it is all one circuit that directly produces the NAND function.  A TTL AND gate is roughly a NAND gate with a additional inverting output stage.

There are many ways to use various different types of transistors to realize the common 2-input 1-output logic gates.  Do not a assume that a NAND is more complicated than a AND, or vice versa.  The same is true for OR and NOR, and other gates.