Receiver Position Not Updated in Radar Example?

I am working through this example on passively sensing radar:

https://www.mathworks.com/help/phased/ug/signal-parameter-estimations-in-a-radar-warning-receiver.html

But I'm confused about how the txPulseTrain is received by the collector. It appears that they are injested by the collector at a single angle, rather than at changing angles over time:

[~, tgtAng] = rangeangle(radarPos,rwrPos);
yr = collector(txPulseTrain,tgtAng);

This may be an okay approximation, but it seems like a more accurate approach is to model the receiver at each timestep, in the loop within helperRWR.simulateTransmission.

Also, in the above code, the rwrPos variable above is equal to its original value when the pulses were emitted, not when they were collected, which seems like an oversight?

Please let me know if I'm missing something with both of these issues. Thank you for putting together the example!