This is quite true. It wasn't until late war that the primary German fighters lost technical parity with Allied ones to an important extant
I think "late in the war" is pushing it. In 1943 the technical capacity of the Americans and British is so much greater that it completely changes the German strategic situation. They are so busy trying to defend airfields at home that they cant keep increasing their strength on the eastern front. Long range offensive fighter projection was a game changing edge in the way that radar or monoplane fighters were. So it's pretty much an even split, the first half the Germans have technical parity but sometimes numerical advantage. The second half they lose technical parity and numerical competitiveness.
On a tactical level, the German fighters were still pretty even (unlike the Japanese, which were equal to the top of the line fighters in service at the start of the war, and rapidly became outclassed) with their US and UK counterparts on a 1:1 level - the big disadvantage was that they were fighting fighters at all, and that there were so
many Anglo-American* fighters to deal with. It wasn't until the very late models of P-51 and Spitfire (among others) that the Luftwaffe's piston-engined planes were totally outclassed, and even then a good pilot (which the Germans were nearly out of) would have made the difference.
*Note: in case it wasn't clear, I use Anglo-American to describe the Allied forces on the Western Front because of the united command - the American and British forces operated under the same overall command and operations were so closely coordinated that they were essentially a single army, navy, and air force. The US and UK forces in Europe were, in fact, more closely coordinated than the USN and USMC were in the Pacific.