I honestly don't think you can make a 'too hard' of a route in Denmark. The lap they did today is quite perfect IMO for infinite repetitions.
Vejle stage recent years with first tiny Kiddes-loop and now this sligthy bigger should have proved you otherwise.
It would be like saying De Ronde is too flat.
In fact first time bike training in the heart of RVV back in the 90ies I was surprised how 'easy' most of the holy Hellingens were, compared to my old training grounds in Jutland.
This hit me, when in my memory I compared Flandern proper to my teens hill training grounds up and down myriads of hills along the deeper part of the valleys formed by Nørreåen, Gudenåen and Lilleåen, up and down with max 5k to next climb, and avg. ascension >1.25% (125 ascension meters pr. 10 km), with tons of smaller but semi-steep hills with avg. maybe just 40-50 meters of ascension, and how suddenly a standard training session of maybe 50-70 km suddenly felt like 200k's in the legs. And then inviting my friends in the hood normally doing impressive avg. speeds at flatter <0.8% avg ascension routes getting suddenly knocked stone cold on just a 110k guided route where they normally did fine with 120-140 sunday rides at speed.
And this was even just west/south-west of Randers property and neither Silkeborg/Ry nor Vejle hill attack terrain with double ascension meters and up to double grades of steepnes.
Yes - a Danish AGR classic is fully doable.
And YES, even in DK a small WC RR loop can be designed at the wrong side of the tipping point, i.e. TOO HARD, making the race itself a snoozefest, either due to early decided race or development into a hesitation race (as latest '21 Imola, too much respect for the decisive climb).
But a WC RR in Vejle area can be made intelligently and with maybe a design like last 40k of todays route. And then before maybe a bigger loop of maybe 2-3 climbs, suitable for break attacks, but not to unload the entire wagon of the peloton for good. Then add the WC +260k distance.
Remember, a WC RR design is not "perfect" because it is designed as hard as possible. It should be designed so a large variety of top riders finds the route temptning. And yet some spices kicking in, but measured. And I seriously believe that this is also relevant in several areas of Jutland.
History is made when it is written, but is rewritten when others tell the same other story an infinite number of times so that it is made a "truth". And then the "truth" becomes that Denmark is generally too flat a country to make a really hard race for the pros. And that Jutland is, after all, exactly the same as flat Amager.
So get on your bike and try your training camp at speed at Amager and then equal along the Jutish stream valleys, up and down, and then ask your legs when they wake up again whether they could feel any difference.
Or maybe just ask Mr. Skjellmose today.
With his origin, he should maybe know a thing or two.
Just my 2 cents.