Agree, but the two are not mutually exclusive. We can buy Thiago and still plan for the future in other ways.
I know Klopp doesn't like a bloated squad, but the number of players we can buy is not finite either.
It's not totally in realms of fantasy that we lose Lallana, Milner and Gini over the next two summers. We're unlikely to lose all three, but it's not impossible.
Or we look to buy a younger player in that position with similar attributes and a high ceiling of potential, like Aouar.
She does mention in the article that Lallana, Wijnaldum and Milner could all leave in the next couple of years but counters it by questioning whether signing a 29 year old who since 2017/18 has suffered with groin, ankle, muscle, spine, calf and knee issues as a replacement would be the sensible option.
She doesn't say explicitly that we want Aouar or will try to sign him, but it is a fair point; Lyon didn't qualify for Europe next season, they've spoken publicly about possibly needing to sell their best players this summer, so it might be an opportune time to move for anyone there we're interested in, assuming we do like Aouar. Thiago would cost more than the £30m that has been reported and, in Melissa's words, wants his "last mega-contract". So with all that in mind, I think a player like Aouar would make more sense from a sporting and business perspective than Thiago, if we have that much available to spend and do want another midfielder.