That's slightly different. I can accept that one volley might bring down the front rank of advancing cavalry and thus terminate their forward movement as the dead and dying horses would cause an obstacle to those behind. However, that wasn't the claim being made. The claim was that the squadron was wiped out.
Mike Loades proved by practical demonstration using the Household cavalry that horses will not tread deliberately on the dead or dying, any more than they are willing to run into solid objects. So, the idea that bringing down the front rank would stop a charge is perfectly plausible.
Incidentally, the French cavalry advance at Minden involved much more than one squadron and was in an earlier time period when infantry were supposed to panic and break when advance upon by cavalry. Everyone on the day assumed that the six battalions advancing on the French cavalry across an open field in line because of a stupidly worded order were doomed. The Marquis de Contades commanding the French forces commented bitterly, "I have seen what I never thought to be possible—a single line of infantry break through three lines of cavalry, ranked in order of battle, and tumble them to ruin!"
In fact, this was an over simplification and further confused by English historians and regimental braggard's who developed the Minden myth. In fact, the infantry advanced in two lines not a single line, and not all the French cavalry were thrown back in ruin. Many squadrons managed to penetrate through the first line and large sections of the first line panicked and bolted for the rear. It was the second line that held firm, not only blocking the escape of the fleeing men from the first line but firing indiscriminately into the pursuing cavalry. However, this was the beginning of the myth surrounding the invincibility of British volley fire which was to persist for the next century.