There's something called Hitchens's Razor which states that
what can be asserted without evidence can also be dismissed without evidence.
The Burden of Proof lies on the one who wishes to assert that Taijiquan and Aikido/Daito-Ryu exchanged content. Those who deny this assertion are under no obligation to provide evidence.
I practice Chen Taijiquan, and from my viewpoint, there are a lot more differences than there are similarities between it and Aikido.
And among the similarities, it tends to be very basic stuff. Aikido's Nikyo is such a common Qinna method that pretty much any martial art style that uses Qinna will have it.
Bagazuzhang:
Aikido calls this Nikyo:
Taijiquan:
White Crane - they practice this hand position which they can apply this Qinna from.
Aikido has Kote-gaeshi - a reverse wrist Qinna which is.... also a pretty damn common technique in martial arts.
Aikido has Ikkyo - which is a pretty damn common in martial arts.
The details and strategies will vary. For example, Aikido might use Ikkyo, bring the opponent onto the ground, and kneel on the ground right next to them. But in Taijiquan, they're going to be standing the entire time; most Chinese martial arts like to stay standing whenever possible.
Aikido might drop onto a knee to bring someone down such as with Shihonage. Taijiquan wouldn't do that. If they want a sharp, dropping energy, they're going to sink onto a leg.
You will need some compelling and specific evidence on what makes you think they're connected. Because it's very easy to point to the very basic stuff that's ubiquitous in martial arts.
Within these basic stuff, there are also variations and depth that are also unique to the style. There are variations in Chen Taijiquan that Aikido would probably not have.