If we assume that small heights (<0.1) are 0, then we correctly identify that covid and sars are separate from the other three. But if we keep all heights then there are some mistakes. Either way, the alpha value does not matter much here.

Newick tree:
 
[
	Human:0.2730175223188302,
	[
		Chimp:0.15,Goril:0.15
	]:0.1230175223188302
]

(Human:0.2730175223188302,(Chimp:0.15,Goril:0.15):0.1230175223188302)

Newick tree:
 
[
	Human:0.2551462012751806,
	[
		Chimp:0.14184782608695654,Goril:0.14184782608695654
	]:0.11329837518822408
]

(Human:0.2551462012751806,(Chimp:0.14184782608695654,Goril:0.14184782608695654):0.11329837518822408)

Newick tree:
 
[
	Human:0.23623162632861536,
	[
		Chimp:0.13333333333333336,Goril:0.13333333333333336
	]:0.102898292995282
]

(Human:0.23623162632861536,(Chimp:0.13333333333333336,Goril:0.13333333333333336):0.102898292995282)

Newick tree:
 
[
	Human:0.2160727165649539,
	[
		Chimp:0.12434210526315788,Goril:0.12434210526315788
	]:0.09173061130179601
]

(Human:0.2160727165649539,(Chimp:0.12434210526315788,Goril:0.12434210526315788):0.09173061130179601)

Newick tree:
 
[
	Human:0.1944100098759538,
	[
		Chimp:0.11470588235294117,Goril:0.11470588235294117
	]:0.07970412752301263
]

(Human:0.1944100098759538,(Chimp:0.11470588235294117,Goril:0.11470588235294117):0.07970412752301263)

Newick tree:
 
[
	Human:0.1709010705815675,
	[
		Chimp:0.10416666666666667,Goril:0.10416666666666667
	]:0.06673440391490083
]

(Human:0.1709010705815675,(Chimp:0.10416666666666667,Goril:0.10416666666666667):0.06673440391490083)