An organization that bombastically calls itself ‘EUvsDisinfo’, splatters a diplomatic photograph with fake blood, and preemptively dismisses counterevidence as ‘pro‐Kremlin disinformation’ does not sound like something that has an interest in exploring this matter in good faith, but I can play along (for now). Simply put, your source leaves too much counterevidence unaddressed. This, for example:

The discussion in London took place on 24 April. Halifax also backed unilateral declarations. ‘A tri-partite pact on the lines proposed, would make war inevitable. On the other hand, he thought that it was only fair to assume that if we rejected Russia’s proposals, Russia would sulk.’ And then Halifax made this comment, almost as an afterthought: ‘There was… always the bare possibility that a refusal of Russia’s offer might even throw her into Germany’s arms.’⁸⁰ Was anyone listening? If you asked the British and French everyman’s opinion, war was already inevitable.

[…]

The failures of the previous five years to obtain agreements on collective security led Molotov to want to pin the French and British to the wall to make sure they would not leave the Soviet Union in the lurch against the Wehrmacht. This was not Soviet paranoia, it was Soviet experience. Would not any prudent diplomat in the same position, after years of being spurned, mistrust interlocutors like Chamberlain and Bonnet? Maiskii’s reports appear to have encouraged the Soviet government to invest in continued negotiations. The obduracy in Moscow derived from doubts about British and French intentions which Maiskii and Surits could not overcome, and that for good reason.

(Source and more here.)

I know that I did not address everything in your link, but frankly I really doubt that you have the time, patience, or interest in reading a thoroughly sourced and exhaustive commentary on it. For simplicity’s sake I chose to focus on the denial that the liberal capitalists wanted a reinvasion of Soviet Eurasia.