I agree with this. Hitler apparently lost a lot of goodwill in Britain after he occupied rump Czechia, which caused a lot of pressure to be put on Chamberlain to take a tougher line on any future Nazi territorial demands, no matter just how legitimate they might seem. Here, Germany wouldn't have squandered its goodwill with Britain yet, which would make it easier for Britain to stay out of any war that involves France, Germany, and France's Eastern European allies. Unless such a war will begin early due to unfinished German rearmament, I would expect Germany to have decent odds of winning this war in the East if Germany is actually eventually willing to spark such a war. Without Britain, France simply won't have enough strength by itself to march all of the way to Berlin or even possibly to the Ruhr if Germany is fully rearmed, especially if Germany will have twice as many people as France has. Germany won't rearm at the same rate as in real life, but it also won't need to start a new war at the same time as in real life either. If a new war does eventually start, I would expect Germany to play defense in the west against France while going on the offensive in the east; after Germany gets what it wants, Germany would issue a call to convene a peace conference. If Poland refuses, then not only are German troops going to march all of the way to Warsaw, but Germany can invite the Soviet Union to enter this war to get the Kresy back, and once Soviet troops conquer the Kresy, they won't be giving it back. Germany can appease Britain by saying that it would be willing to withdraw from the indisputably Polish parts of Poland (including Warsaw) and Gdynia once Poland would agree to a peace deal to end this war, specifically one that would involve Polish territorial concessions to Germany (and possibly to the Soviet Union as well).With the exception of Danzig and the connection to east Prussia all of those gains were made OTL without war. With a leadership less insane and violent than the Nazis they should still be possible in TTL. Without the betrayal of the annexation of the rump Czech state and a still democratic and legalistic Germany why would Britain and France support Poland against such limited demands - especially if steps to protect Polish access to the sea for economic purposes were included? Without western support and with Russia still the primary threat to the east its quite likely that Poland would give up without a fight.
Germany actually hide significant rearmament or at least clear breaches of the Versailles Treaty long before Hitler came to power and again they were planning what became known as the pocket battleships which again breached restraints under the Treaty. As such even with a much lighter level of rearmament - which would greatly aid the German economy compared to OTL - Germany should be able to achieve the targets on that map.
In this TL, Germany will presumably declare that it is permanently satisfied after acquiring specific Polish lands and perhaps Austria as well and won't be acquiring any additional territories unless it will be done through a mutually agreed territorial purchase, as was the case for Louisiana in 1803, Alaska in 1867, and the Danish West Indies in 1917 for the US.